I absolutely hate being shortchanged anywhere! If this happens, the manager should ask about the time it happened. That way he/she can determine who was working the register at that time. The manager should pull the sales record for the day and count the drawer to see if there is the correct amount of change. The manager should be able to determine if the customer was shortchanged. However, if the drawer is off, it doesn’t necessarily mean that particular customer was shortchanged. If you are going to claim that you are shortchanged, then you need to come forward when you get your money back from the cashier. I always count my change when it is returned to me just to make sure.
I have seen a lot of cashiers who set the cash to the side when they are counting a customer’s change just so they know exactly the amount the customer gave them before giving them their change.