[header] How to trace a money order [title] Be sure that you have the proper receipt. [step] In order to track your money order, you'll have to have the correct receipt; that is, you'll need the one with the serial number or receipt number of the money order on it. For usps money orders, this will be the stub on the side of the order. 
For western union orders, this will be the bottom portion. [substeps] Some resellers (convenience stores, supermarkets, etc.