This article analyses the judgment of the Supreme Court of Poland of 25 June 2020, in which the Court refused to recognise registered mail receipt forms issued by the authorities of the so-called Turkish Republic of Northern Cyprus (TRNC) as foreign official documents, despite the Public Prosecutor General and the claimant arguing to the contrary. The text attempts to show that the ruling is consistent with earlier Polish practice and the majority view in domestic literature. Still, the international jurisprudence shows that there is no clear rule of public international law that would make non-recognition of documents absolutely mandatory in such cases, and some exceptions could even support their recognition under special circumstances. Also, in similar cases foreign national courts do not always refuse recognition.