Years ago we got a bill as change in Williamsburg, and it looked strange. We were afraid to spend it in case it was phony, so we called the SS and were told to send it to them. If it were legal, they would return it. We did and a few weeks later it came back in the mail with a letter telling us to take it to the bank to cull. We kept it and the letter. :)
I think with the economy continuing to tank we will see more and more of these, and actual silver coins. I am sure there are people who have stashes of cash or coins who will begin to dip in to them.