Some strategies in management can use to implement controls to ensure the integrity and existence of the client's cash balances. Reconciling cash can be a great control in most cases since receipts tie to deposits so it's accurate and cash exists since it hits the bank account. Now reconciling on a daily basis is important as well but would you be able to negotiate the cash box if the employee was using a lapping fraud to steal money? 

If they took $100 of cash and issued a manual receipt to the customer then used the next $100 to come in to clear the AR from the first customer on the cash receipt system, wouldn't I still reconcile? What could I do as a manager to prevent this type of fraud from occurring?