A guy was offering a cart load of cement encased Sands "H.N.O." chips. Also, cement encased Pioneer (Laughlin) tokens and cement encased Frontier (Las Vegas) tokens.

My question is....

Were all of these from the same dig?

And a follow-up... If not, where there then 3 digs, all taking place at the respective casinos (Sands, Pioneer and Frontier)?

Thanks!!