This article is from the Paris, France FAQ, by Thierry E. Toniutti and Delphine Kensit nemo_n@yahoo.com.
If property is lost in a subway or bus, go immediatly to the terminal
point of one or the other, and you may find it there.
Otherwise, 48 hours later, call :
The Lost and Found Office
Prefecture de Police
Bureau des Objets trouves
36, rue des morillons 75015 Paris, ph : 01.45.31.14.80;,
Metro: Convention
Open daily, except Saturdays, Sundays and vacations, 8:30 am to 5:00
pm.Tuesdays and Thrusdays till 8:00 pm.
Anything lost will be returned to this office. It is wise to report to
the district Commissariat de Police if you know exactly where you lost
the item in question. If found you will be required to pay 4% of the
item's value for the service. Lost property is held for one year and
one day.
 
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