If you have found an object lost in Paris or in the departments of Hauts-de-Seine, Seine-Saint-Denis and Val-de-Marne, here is what you can do :
On public roads: Drop it in the nearest police station of the city.
On the RATP network : Contact the network agents.
In an airport : Drop the found item at the competent airport department.
In a public Parisian establishment (Eiffel Tower, department stores, museums, fairs and exhibitions, etc...) :
Drop it to the appropriate service
You can also drop the found item to the lost property service of the Police headquarters of Paris, 36 rue des Morillons in the 15th arrondissement
Opening hours :
-Monday to Wenesday from 8.30am to 5pm
-Thursday from 8.30am to 12pm
-Friday from 8.30am to 4.30pm