Ok, the TV show mysteries at the Museum had an interesting story. An original copy of the Constitution was stolen during the civil war from the capital of SC.

The document was stolen by a union soldier who sold it for five dollars to a fellow soldier. The family of the fellow soldier kept it until 2001 and sold it to an antiques dealer.   The dealer tried to sell it at auction. The auction company notified the FBI, They seized the document and gave it back to the state of SC. For it was originally stolen. What is the difference here

In Europe, many high end paintings have been returned to Jewish families that were stolen by the Nazi's.