Ive never used a money order but the guy is as legit as they come and runs alegit buz, he would have no reason to screw anyone. However, as with all cash transactions its a very good idea to ship express and even insure it. Next best thing is priority with delivery conf. If you cant prove he received a package he shouldt be held responsible for the USPS fuck up, which believe me I have first hand experience with and it happens A LOT!