Far beneath the theater, through a winding set of half-forgotten corridors, there was a large room that was, at present, the residence of one Dr. Sara Bellum, chief scientist and tinkerer of VILE. Diagrams and blueprints lay scattered like a tornado had blown them about, bits of metal and wire...
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.
I've also found that the two thieves were leaving for Algeria, thanks of a trace of DNA evidence recovered from a helmet and their past in burglary cases according to the police.