pooya, here is what you should do before sending the money order back .i am sure you know bunch of guys who do exchange and they be getting bunch of staffs from state and cashing it. so talk to one of them and tell them the story they will definitely help you out .the one i have known for many years is keyvan a real nice guy and his office is in toronto, he might have one in your neck of woods as well.
however it is unwise to send the money order back to masoud, the guy is a high risk and might get banned anytime, play safe though.
joking aside i have known masoud on line for so many years, honestly he is a real classy guy with some temper .