[allannienhuis]

Perhaps the person from whom it was stolen can't prove they owned it legitimately? I expect stealing stolen goods has higher odds of not being reported so lower risk for the thieves. That said, stealing from people who might own stolen expensive art might not be the smartest thing to do... :)

[casefields]

That’s why OP asked if the burden of proof is so absurd that you have to show receipts back to 1602 by Carravaggio himself. This should be easily answered in the article but isn’t.