About 3 years ago (I think) CBP made a huge drug bust in the building I work out of. Turns out, the smugglers were mixing cocaine with plaster and molding it into picture frames. The art itself, contrary to their initial suspicions, wasn't of any note.))
Actually, the only thing that wasn't stolen at the Louvre's Apollo Gallery is the Regent Diamond, figure no one would take it because something to do with a curse.