I see the odd silver coin every once in a great while...consider yourself lucky if you find one.
It seems like about the only time you might score is when some kid steals them out of dad's coin collection and buys some candy or whatever ... at face value. I searched through a lot of change as a kid in the late '60s and '70s. Not much since.
The last coin of numismatic value that I found was a steel nickel about 5 years ago.
I had a silver quarter given to me in change about a year ago. I assume the kids not knowing what older coins were passed that on to me.
How worn was the coin? Most of the silver I found years ago was well worn, poor to fair condition. I had a stack of buffalo nickles sorted from the rest that you couldn't even read the dates. It would be a wonderful day to find silver that was in very good to fine condition in circulation.
Depends on the state. You seem to find more in lower pop states. Probably because of the age of the population. We have a few already that were unintentionally gifted to use in a roll.