If you buy stolen goods, if it can be proven,
you DON’T get to keep it weather you knew or not.
At least not here.
How far back does that principle go?
The USA violated just about every treaty it ever signed with the Indians. Do they get the land back?
imagine this -- your granddad owns a building in 1939. Then the city itself gets destroyed. communists come and build blocks on top of the property and give it to various people. Those people are refugees from various places. Those people sell to other people etc. until 75 years pass.
It's quite a different proposition from E.Wedel