I always assumed the cashier was smart enough to put it to the side and not in the drawer. I honestly do not know what to say about a cashier that wouldn't know how to handle this, when I was a cashier it didn't throw me to have a few pennies, nickels and dimes to the side in a "give a penny get a penny" sort of way

. I'm going to keep doing it and assume if it is ever a problem the cashier would say no thanks