any SilverBugs/Coin Roll hunters here? Check this out!

My father purchased a bag from the bank here in town.Traded in $180 for $1200 essentially. The teller called him and asked if he was interested in buying the bag.

How do you go about asking the teller for silver coins? i figure its a precious metal so it will go up in value. No harm in collecting silver dimes and quarters like anyone else would a stock or mutual fund.