Published in 1994 any perceived fault of omission almost certainly should be attributed to the ca. '91-'93 thawing of Soviet era Russian archives which naturally include canonical seized evidence from occupied and overrun territory. This was a very brief window of opportunity for study before the doors closed permanently again, making investigations into thema prioritized over forensic exactitude. Unavailability but theoretical existence of probative evidence reinterred by Moscow hasn't been ignored by dealers in arguments in every conceivable way. (My late business partner dealt in antiquities from the late sixties until the end of the eighties although nothing of European provenance or at least knowingly tainted by this era)
https://en.m.wikipedia.org/wiki/The_Rape_of_Europa_(book)
There's a well reported 2007 documentary upon the book about which I was unaware:
https://www.pbs.org/therapeofeuropa/
Published in 1994 any perceived fault of omission almost certainly should be attributed to the ca. '91-'93 thawing of Soviet era Russian archives which naturally include canonical seized evidence from occupied and overrun territory. This was a very brief window of opportunity for study before the doors closed permanently again, making investigations into thema prioritized over forensic exactitude. Unavailability but theoretical existence of probative evidence reinterred by Moscow hasn't been ignored by dealers in arguments in every conceivable way. (My late business partner dealt in antiquities from the late sixties until the end of the eighties although nothing of European provenance or at least knowingly tainted by this era)
Edit: thema not themselves, on mobile sorry