Fake one ounce silver bars sold in Colorado.
The producer of these bars will certainly keep trying. Shocking that someone would purchase silver bars without testing of any kind. It is very easy to weigh, measure, and ping test bars and coins. Acid testing and specific gravity are straight forward as well. Caveat emptor.
And, link to earlier story re: fake silver eagles found by Canadian police:
Testing for weight exposes these coins as fakes, as well.