I was just outside Pilsen last Summer for a short visit. There are a couple of Pilsen museums that should have pertinent information.

Patton Memorial Pilsen

www.patton-memorial.cz

West Bohemian Museum

www.zcm.cz

I am rather confident that they have a list of items missing from the nearby castles after Patton's men paid a visit therein.

With kind regards,
Jani