I could be wrong, but I think:

In the US, stolen goods are still stolen goods, no matter how many hands they've passed through, innocent or otherwise. If I buy a stolen empeg, even thinking it's a legitimate transaction, law enforcement officials have the right to reclaim it without reimbursing me. If that happens, I may be able to redirect the law enforcement to whomever I bought it from, but I'm not sure it would work to get my money back.