Nice tip. You actually are getting silver? About what percent of rolls contain some silver now days?
IIRC, pre 1965 quarters were 90% silver, 10% copper and pre 1971 half dollars 60/40. like I said, everyone seems to be doing it these days. If you get a roll that came from the Treasury, via the bank you'll have about a 0% chance of finding any silver. Customer rolled, I've heard people getting $4-$5 face value, recently. Those hauls seem to be getter fewer and farrer between, though.