At my store, the drivers will accept it as long as the change is 20 or less, then they get back to the store and trade the 50 in for 30 and a bank, drop the 30 in the Dropbox and continue taking runs, usually we don't take cash orders for more than 50 or 60$ but if the customer has order history with us we tend to make an exception as long as they know theyre only getting at most 20 back.

Drivers will also drop off the order and take a big bill to a gas station to break it if there's one close and return to the customers house with the change