I love to listen to the challenges business folks face.
I don’t quit understand the problem you are describing. People walk off with your quarters?
If all the ATM dispenses is $20s, they change them into more quarters than needed for laundry, so they take the excess with them. That requires me to order sacks of quarters from Brinks, or clean out my local bank’s rolled inventory from time to time. Vending $5s solved that proplem.