How can you trace a money order online?

I GOT SOME MONEY ORDERS IN THE MAIL THIS IS THE 2ND TIME THE FIRST ONES WERE FAKE THESE ARE FROM A DIFFERANT SENDER IS THERE A PLACE ON LINE TO ENTER THE SERAIL NUMBER TO FIND OUT IF THEVE ALREADY BEEN CASHED money order were sent to me ups they want to cash them keep 10% and wire the rest western union to a nother country