Note Uxxxx8613xxx has been entered 2 times. This is a 5 Euro note from 2002. The printer code is Lxxxxx. This means that the note was printed at Banque de France (France - Chamalières) for France. Users who have entered the note are:
Power Park (edited later: on my summer holiday we stopped in ABC Kanervala/Joensuu, where I spent 5 euro note 7.8.12, so it might be this one... or maybe not, interesting anyway)