Since cash is probably used to purchase the money order those monies have been given to the place that prints out the money order. However in many cases the person can get a replacement money order....
A money order is a payment of a pre-scheduled amount of money that you can send to someone or receive. You can go to a store or a bank. The money order must be paid in full at the time of purchase....
If you have lost a money order but you still have the receipt for the money order, you can go to the bank (or post office) where you bought it, and get a replacement.