Stolen Soulages painting allegedly sold through Christie's

A family is claiming that a Pierre Soulages painting, stolen from them back around 1977, ended up being sold at Christie's as part of a prominent collection. The Zeckendorf family has filed a lawsuit seeking the proceeds from that sale. Soulages built entire worlds out of value alone, black on black, light caught in texture, so it's wild to think a piece like that just circulated for decades without anyone flagging it. Makes you wonder how many works out there have murky provenance that nobody's looked hard enough at. What's your take on how the art market handles stuff like this?

Source: ARTnews — https://www.artnews.com/art-news/news/pierre-soulages-allegedly-stolen-weis-collection-christies-1234792426/