A mom and pop store doesn’t require the internal controls to process cash. An organization with multiple shifts and employees requires an entire set of internal controls to handle cash and it is expensive.
Once upon a time, I was the business manager for a Mom and Pop sized business. I handled the cash deposits and matched it with register receipts. It was usually just short of $1000 per day and the cash I deposited varied pennies from the register receipts. When I locked up and went home for the night, I dropped off a matching deposit on the way. Easy peasy.