The chances that you will get any are pretty slim. Of course, there are none in circulation to begin with. When some do get in circulation it is most likely because some kid raided his dad's collection and they are quicly plucked. Electronic
coin acceptors will reject them unless you program them as an accepted
coin. I do, and still hardly ever get one, maybe one every few months, across four washes. Usually, when there is a silver quarter in the mix, it will stand out in color and will also sound different. All that being said, don't bother, you ain't gonna find any.