Have you seen INTERPOL's Most Wanted Work of Art posters? I discovered them when doing research for 

Death in the Aegean, and have used them in my books.

They list what the item is, and when and where the item was stolen.

If you've seen any of these stolen artworks, contact INTERPOL.

This is the Louvre Heist Most Wanted Works of Art poster. Learn more by attending one of the Curators of Crime presentations.