Czarne pudełko NBP, które może być dużo warte - wzorów banknotów kolekcjonerskich Jan Paweł II itp.

Perhaps you've also attended a conference or a meeting of the National Bank of Poland (NBP) where attendees were given boxes with banknote samples inside as souvenirs? Don't ignore it, throw it away, or let your children play with it, as it could be worth a lot. See what's inside. The set is up for auction here: https://aukcje.gndm.pl/pl/banknoty-wz...