I work in a bank and we get rolled coin by the box. I find, on average, 3 - 5 silver quarters or dimes per box. Some boxes contain more some none at all. Luckily the rolls within these boxes are clear plasic and you can see the silver coins among the clads. I just replace the silver coin I find with a clad coin from my pocket change. I've accumulated quite a nice silver stash over the past couple of years.