I've always wondered if I located an ex-military aircraft either in a lake, ocean, private property, state or national park or dug one up in my back yard, what are the rules of engagement. Also if I had a grandfather (which I don't) that had a Corsair covered for years in his barn, could the government come get it if it didn't have any paperwork anywhere. How about if you found an old wreck on your farm that had been sitting there for years with no way to really trace how it got there, you take that wreck and restore it to airworthy condition. Could Uncle Sam come take it away from you? ... I know we have discussed this a bit before, but I couldn't find the thread. I did find this link below to be interesting.
http://www.history.navy.mil/branches/org12-12a.htm