I bet he was begging you to take them off his hands.
He makes a quick $100.00 and you will likely not be able to pawn them off anywhere, or get a reputable dealer to melt them down.
Did they burn your fingers when you put them on? LOL.....
If they were his and legit, then I think you did quite good.
By the way are you into metal detecting, or is this just a short visit for you?