Walt;U.S.Goverment will not allow any person or company to make coin or currency for trade in the U.S.A.,but the casinos issue credit in the form of chips and silver stricks which can and must be taken back to that casino.Case in point Tropicana will take back or will sell to you from the cage as many as you want to buy, but no other casino will take one from some other casino. When the Sundowner closes they have to allow enough time to buy back thier silver and chips because it was credit at thier casino.