We had a guy come by our house one day when we had first bought and he had some "artifacts". We thought it was a crock, but Butch gave him some $ for it because the guy looked hungry.
Months later, I had a policeman visiting. He saw the "arrowhead" and made a HUGE deal out of it saying it was illegal to privately own it.
We were told that anything of historical value had to be "declared".