sienkosyn-com.pl is a scam: the fake Polish company and the legal notice that proves nothing

Disclaimer: we are a law firm dealing exclusively with online fraud. This article arises from a real case handled by the firm and is published in anonymised form as regards the injured party, for public-interest purposes. The technical data reported comes from checks on the public domain registries carried out at the date of publication. If what you read sounds familiar, you can submit your case through the form at the bottom of this page.

"We are a company officially registered in Poland, with physical premises and a verifiable legal existence." That sentence was written to our client when he asked for guarantees. In support, he was sent a link: the legal-notice page of sienkosyn-com.pl.

sienkosyn-com.pl is a scam: it is not the website of a Polish company, it contains no verifiable corporate data and it corresponds to no business entered in any register. It is a domain created to give a legal façade to a seller who did not exist. Our firm has already handled this case — 7,000 euro paid for a motorhome never delivered — and here we explain how the existence of a foreign company is really verified.

Why sienkosyn-com.pl is a scam: the hyphen in place of the dot

The first deception of sienkosyn-com.pl lies in the name itself, and it works because the eye reads the shape rather than the characters.

Look carefully: sienkosyn-com.pl. Read quickly it looks like "sienkosyn.com", a classic international commercial domain, with a nod to Poland added. It is nothing of the kind. The registered name is sienkosyn-com, with a hyphen, under the Polish national extension. The sequence "com" is not an extension: it is part of the name, glued there to resemble something else.

It is a known and documented technique, and it is worth learning to spot because it is used constantly, above all with the names of banks and couriers. The rule is always the same, and it is the one we explain in all our articles: read the address from right to left. Start at the extension, take the name immediately before it, and that is the domain. Everything else is costume.

And one detail closes the matter. We checked whether the domain sienkosyn-com.pl imitates — sienkosyn dot com, without a hyphen — actually exists. It does not: it is not registered, it does not resolve, it has never had a website. So we are not looking at a copy of a real business, but at an invented name dressed up as one.

The legal-notice page: the document that proves nothing

The link sent to the client, as "website and legal notice", pointed to a page of sienkosyn-com.pl devoted to its security policy.

Here lies the psychological mechanism that makes the sienkosyn-com.pl page an effective scam: a legal-notice page looks like a document, but it is not a document. It is a text anyone can write, copy or generate in two minutes. It is filed with nobody, checked by nobody, connected to no register. Its existence proves nothing about the existence of the company publishing it.

Proof that a company exists is never on the company's own website, and therefore could never be on sienkosyn-com.pl. It is in the business register of the country where the company claims to be incorporated, a public archive kept by an authority, searchable by anyone and free of charge.

And here comes the point that matters to anyone dealing with a foreign seller. Throughout a negotiation lasting days, the counterparty never supplied: a full company name; a registration number; a tax or VAT number of the declared country; an address of the registered office; the name of a legal representative; an invoice bearing corporate details.

He supplied a first name and the link to sienkosyn-com.pl, nothing else. When the client pressed, he took offence and invited him to avoid "denigratory statements".

This is the litmus test, and it deserves carving in stone: anyone who has a registration number writes it down. It is a handful of digits, sent in ten seconds, and checking it takes a minute. Anyone who answers with an indignant sentence instead of the number is saying, without saying it, that the number does not exist.

How a Polish company is really checked

We devote a section to this because it is the most useful part for anyone sent a page like that of sienkosyn-com.pl, and because almost nobody realises how simple it is.

In Poland, limited companies are entered in the KRS, the national court register of businesses. Every undertaking also has a NIP, the tax identification code, and a REGON, the statistical code. Sole traders are instead entered in the CEIDG. All these registers are public and searchable online free of charge.

The correct procedure, applicable to any European country with the corresponding registers, is this.

First: ask for the number, not for the website. The question to put is exactly this: what is your full company name and what is your registration number. Not "are you a serious company?", a question everyone answers yes to.

Second: check the number in the register, not on the seller's site. The number goes into the register's public portal; confirmation is not sought from the counterparty.

Third: check that three things match. The name, the objects of the company and the registered office. A company registered for consultancy activities that sells vehicles is an anomaly. An office that is a residential address, or a mail-forwarding service, is an anomaly.

Fourth: check the date of incorporation. A company a few months old selling vehicles worth tens of thousands of euro deserves particular attention.

Fifth: check that the account holder matches. This is the decisive check, and we return to it below.

If the counterparty answers with a site like sienkosyn-com.pl instead of the number, the check is already over: there is nothing to verify, and no payment is made.

The technical check: three domains registered in three days

Let us turn to the domain registries, because the data gathered on sienkosyn-com.pl carries the most weight in a complaint.

sienkosyn-com.pl was registered on 24 April 2026, expiring on 24 April 2027: a one-year registration, the minimum term. The holder is recorded as a natural person, not as a business — which flatly contradicts the claim to be "a company officially registered in Poland".

Nor is it isolated. In the same operation the organisation used a fake mapping site to manufacture proof of the physical location of the purported premises. That domain was registered on 23 April 2026, and a spelling variant of it on 22 April 2026.

Three domains, sienkosyn-com.pl among them, registered on three consecutive days. All three with a one-year registration. All three resting on the same authoritative nameservers, of the same hosting provider. The sienkosyn-com.pl domain also has mail records configured with the same provider, meaning email could be, or was, sent from that name.

This combination is not accidental. A caution: sharing an IP address alone would prove nothing, because thousands of unrelated sites coexist on a shared server. The serious indicator is the set: the same authoritative nameservers, registrations concentrated within seventy-two hours, the same minimum term, the same provider. It is a single account, a single purchase, a kit bought to stage a sale that was never going to happen.

The operational consequence is the reason to move at once. The domains are still registered, expiring in April 2027. The registrar and the host currently hold the account name, the email, the payment method, the access IP addresses, any mailboxes created on that domain and — the most valuable item — the list of other domains held in the same account. That list very probably contains the names used with the other victims.

This is, for sienkosyn-com.pl as for the other two domains, material obtainable only through a judicial request, and it must be expressly sought in the complaint. At the date of this article the pages of sienkosyn-com.pl are no longer reachable from our browser, although the domain remains registered and active in DNS: the typical signal of a structure closing its shop windows while keeping the names. Anyone who still has screenshots or saved pages holds evidence that cannot be created a month from now.

The story: from Finland to Poland, and premises that were never there

The context in which sienkosyn-com.pl was used helps explain why the legal notice mattered so much to the fraudsters.

The negotiation starts from an advertisement on a social network for a motorhome. The writer presents himself as an intermediary, with a first name, and initially proposes a visit to a dealership in Finland, supplying the authentic contact details of a genuinely existing dealer — used without its knowledge — and assuring the buyer: no deposit, no advance payment, everything is paid on the spot after seeing the vehicle.

Then the vehicle "changes", and with it the country: no longer Finland but Poland, with an appointment in Białystok. And the rule changes: 3,000 euro of booking money is required, to be transferred within an hour because the booking "expires".

It is at this point that the two domains enter the scene. To the client's question — where are you, who are you — the answer comes as two links: the location on a fake mapping site and the legal notice on sienkosyn-com.pl. Two pages, built by the same hand at the same moment, to answer the only two questions a prudent buyer asks.

With 3,000 euro paid and the journey arranged — a flight to Warsaw, a train to Białystok — comes the demand for 4,000 euro more by way of guarantee. The client objects, and receives the full repertoire in reply: offence ("avoid denigratory statements"), the appeal to personal trust ("it is I who collect, not the supplier, because I am your trusted person"), manufactured social proof ("take a look at the reviews group"), simulated abundance ("many Italian buyers pay fifty thousand euro in a single transfer", "I have ten buyers waiting"), aggression ("I do not like complicated clients") and finally the bogus refund procedure ("just start a dispute, it may take up to a month").

The client pays. A few days later he is asked for another 3,500. At that point he stops. Total paid: 7,000 euro, besides the flight and train already purchased, themselves recoverable loss to be documented in the complaint.

The datum that contradicts the legal notice: a private account in a third country

There is one check that would have dismantled the sienkosyn-com.pl legal notice in thirty seconds, and it requires no technical skill at all.

The self-styled company declared itself Polish. The dealership was presented as Finnish. The bank details given for payment were those of a natural person at a French bank, with a French IBAN.

No company — least of all the one said to stand behind sienkosyn-com.pl — collects into a personal account held by a private individual in another country. It is not a formal irregularity: it is an operational impossibility, because a company selling vehicles must issue an invoice and the price must be shown as received by it.

This is the rule that always holds, in every distance purchase: the account holder must coincide with the seller named in the contract. If it does not, the operation stops, whatever explanation is offered.

Add the detail of the imposed payment reference: the client was required to state a first name and an alphanumeric order number. An order number paid into a personal account does not identify a contract: it identifies a position in a series. The institution should be asked for the list of operations bearing references from the same series, because it is the fastest way to bring the other victims to light.

We do not publish here the account holder's name or the full IBAN. A person who lends an account is often themselves recruited through a bogus job advertisement or a victim of identity theft: their position must be established individually by the authorities, and the forum for that is a filed complaint.

The technical good news is that the receiving institution is established in the European Union. It is therefore reachable by European Investigation Order, with no letters rogatory, and is required by law to retain and transmit the holder's identity, the account-opening documents, the access IP addresses and the full transaction history.

The legal framework and the deadline now running

The payments made after seeing sienkosyn-com.pl date from late October and early November 2026.

As the facts post-date the entry into force of law 90/2024, art. 640 paragraph 2-ter of the Italian criminal code applies, aggravating fraud committed remotely by means of computer tools capable of hindering identification of the perpetrator: and here the obstacle was built piece by piece, with a first name and no surname, a fake mapping site, the fake corporate site of sienkosyn-com.pl and an account held by a third party in a further country.

To this are added the aggravating circumstance of particularly serious financial loss under art. 61 no. 7 and, where its conditions are met, diminished defence under art. 61 no. 5, recalled by art. 640 paragraph 2 no. 2-bis.

Also relevant are identity impersonation under art. 494, for the use of a real dealer's authentic contact details, and misleading commercial practices under arts. 21, 22 and 23 of the Italian consumer code: falsely claiming trader status and the existence of premises are expressly listed among practices considered misleading in all circumstances. Publishing a legal notice that attributes to oneself a non-existent corporate status falls squarely within that provision.

As to the deadline for anyone who paid after consulting sienkosyn-com.pl, simple fraud is prosecutable on complaint filed within three months of knowledge of the fact: with payments of early November 2026 the deadline falls at the beginning of February 2027. The aggravating circumstances in the second paragraph of art. 640 entail prosecution of the court's own motion, but filing in time remains the sounder course.

And it is the same window in which the domains are still registered and the data held by registrar and host is still intact.

What to secure immediately

Anyone caught up in the sienkosyn-com.pl affair should keep: receipts and confirmations for every transfer, with full beneficiary details, IBAN, BIC, country and payment reference, including the order number; a native export of the entire conversation, not screenshots, because the export preserves numbers, timestamps and file identifiers; the original advertisement and the profile it came from, with the date; all links received in their complete form, including those of sienkosyn-com.pl and of the fake mapping site; a complete save of the pages, if still possible; any invoices or booking documents received; air and rail tickets and every other expense.

On that basis a complaint is drafted alleging aggravated fraud under art. 640 paragraphs 2 and 2-ter, with the aggravating circumstances under arts. 61 nos. 5 and 7, identity impersonation under art. 494 and, in relation to the receiving account, money laundering under art. 648-bis. Together with applications for acquisition from the registrar and the hosting provider of the registration data of sienkosyn-com.pl and of the other domains in the same account, acquisition of banking records, identification of the account holder by European Investigation Order, and seizure.

Similar cases already handled by the firm

The fake mapping site used alongside sienkosyn-com.pl in the same operation is analysed in map-ap-go.com. You may also find useful our analyses of transwest-parcel, on the bogus courier and invented customs charges, of artisanworks.vip, on very short-lived domains, of blazoncommunity.com, on companies displayed as a guarantee, and of botongde.com.

If you paid after seeing the sienkosyn-com.pl legal notice

The picture is this. sienkosyn-com.pl is a scam: a domain built with a hyphen in place of a dot so as to resemble an international commercial address, registered in April 2026 in the name of a natural person together with two other domains of the same series, devoid of any verifiable corporate data, used solely to display a legal-notice page as though it were proof of legal existence. Collection took place into a personal account in a third country, under a numbered reference, and the demands for money continued after the main payment.

The facts are very recent, the domains are still registered and the data held by the registrar and the host can still be obtained. It is the best condition in which to act, but it does not last.

Our firm has already handled this case. You can submit your position for a preliminary assessment.

If you have suffered the same scam, we can help you. Fill in the form at the bottom of this page.