zd, in this case (assuming the cashier didn’t pocket the money), there would more than expected in the drawer (is that called a longfall?). Maybe one of the CR’s cashiers can tell us what happens in that case.
In many stores, the cashier doesn’t put the money tendered into the drawer until the customer has received the change. That’s so the customer can’t claim he gave the cashier a $20 bill when it was actually a $10.