[SJackson]

Art dealings from that period are very murky, from what I have read. Goering was famous for paying fair value or even over fair value on his trips to Amsterdam and Paris early on.

When sales are involved rather than looting, "Fair value", impossible to determine, isn't always the issue, rather the forced nature of the sale.

[KellyAdmirer]

A lot depends on whom the burden falls, I suppose. Proving coercion in an undocumented transaction 60 years on may be difficult. I would be inclined to give the heirs the benefit of the doubt, but the law may specify otherwise.