I was picking a load of pennies and nickels from my local bank & the teller (a 25 yr old girl) asked what I was doing with them ? I told her I was looking for old dates and she mentioned when she is rolling them up she grabs all the old dates from all coins.
At first I thought I just picked a load of coins for nothing. But when I got home I found a nice 10% yield of pure nickel and 50% yields of pure copper. I suspect she is aware of which dates contain silver, but has not caught onto nickel and copper coins being worth more than face value.
In Canada, it bad enough competing with the government and other hoarders. Now the young tellers are starting to catch on. The old tellers still think all silver is completely gone from bank rolls, but are not aware of the occasional heirs than cash in their dead relatives hoards.