He didn’t crawl out from under a rock. He knows something about retail money handling.
The money should be put through the slot in the drop safe. The store wouldn’t accept a $100 dollar bill. That customer would have to buy elsewhere or use a credit card.
The employee has no access to the drop safe and in many locations, the manager doesn’t either. The manager has one key and the armored car company that picks up the money has the other.
I ran a gas station during the last gas crisis (Jimmy Carter). The armored car company would often pick up more than $20,000 daily from the safe. Every $50, I or my employee on duty would put the money in an envelope and push it through a slot in a floor safe that we couldn’t open without the armored car company.
Not every buisness has a drop safe and not everybody in Wyoming accepts plastic.