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.
I get that. A mom and pop store is different from a formal corporate like entity that needs to answer to a board of directors or the taxpayers.
When cash is involved, you need a set of internal controls to safeguard the cash. It is merely not trusting the employees, it is also protecting them from false accusations.