Taking souvenirs from the presidential residence is a long-standing tradition in France. But the fact that pieces have not discreetly disappeared into private collections—instead making their way onto eBay—might mean that the French government will step up its role in preventing theft and recovering stolen objects in a more transparent manner. It isn't yet clear what happened to the eBay listings or how the French government plans to recover them. But in the meantime, France’s culture ministry has come up with the brilliant idea that it is now mandatory that missing items be reported in an online database they’re calling Sherlock.
Source : http://www.slate.com/blogs/the_eye/2014/08/04/stolen_national_treasures_from_france_s_elysee_palace_turn_up_for_sale_on.html