Those who have lost or have been robbed of any kind of object can ask for information here:
U.O. Economato
Ufficio Oggetti Rinvenuti
Corso d’Augusto 154
47900 RIMINI

The store rooms are in via della Lontra (next to via della Gazzella - Grotta Rossa) and are open to the public on Thursdays from 9am to 4pm in Winter and to 5pm in Summer.  Those who claim objects must exhibit a police declaration of theft or loss.