Not sure about the guidon however, when Major Walsh of the NWMP bought a 7th Cavalry horse from a Metis who bought it from a Sioux up here in Canada, he checked with U.S. authorities to see if they still had a claim on it. The reply was that the U.S. government had wriiten off all the missing 7th Cav horses and that he (Walsh) could keep it. Maybe the same rule applied to the guidon. I'm just a guessin', mind you.