Paris, région parisienne objets trouvés/Paris, Paris region lost and found
Where to go or call if something is lost or found in Paris. To start, check the lost and found map Lafmap, perhaps someone has already found and published an announcement about your lost item. Call all the places where you have been and where you could have lost your item. If it's not there, then publish an announcement on Lafmap www.lafmap.com.
Public Transport
Police Lost and Found Center
Lost and Found Bureau
Other Places
If you have lost something in dining establishments, hotels, or shops, it's best to look for contacts of the organization where you think you may have lost your item.