I know the both of us think non-ferrous and it's coming out for the beach. The one thing that shocked me about the D2 is how it can throw ID numbers around. The pull tab range is ridiculous, and I once found a huge chunk ring of 14k white gold that came in a solid 99. I verified gold too on an acid test.
Just dumfounding what that machine ID's at sometimes, so that 82 number does not surprise me.