Sometimes coins don't get ejected but don't get counted either and end up in a separate container meant for trash, damaged coins, and other non-coin items.

Coinstar has their employees ship any coins found in that to an office that definitely profits off of them. Corporate also been known to go to random machines, and put in specific coins that will go into that container, then watch for the employee to send it in. If they don't send it in, coinstar fires them for stealing.