The only thing you can do is run for congress and change the law. The law says once stolen property is located, it is taken and given back to the owner.
Let's create a scenario based on what you think should be the law. Stolen property is sold to a dealer. He doesn't know. Buyer buys it. Dealer dies, has no heirs or estate. Property is found to be stolen. Buyer gets to keep it-onus is on dealer, who is now dead. Actual owner is SOL.
Is Shadroch maybe specifically talking about Original Art which may have been stolen from Marvel's offices and is now making it's rounds?