Here is a story about Postal MO that happened to ME.
A few years ago my wife wanted to do a "work from home" thing. $1 per envelope she stuffed,, heck if it were true I was gonna quit my job. BUT me being the non trusting type, I told her she MUST use a Postal MO. (Any thing that costs money to make money is BS)
So,, she sends I think it was $60 with a P MO. the scam worked like this, she was supposed to get others to send $2, (forget the exact transaction) then my wife was supposed to send each $2 to the company, then they would send $1 back. At reading this, I asked for our money back, they said "NO, and they were going to sue us if we backed out of the deal" I advised them this looked like a pyramid scam, and we were NOT going to participate. They again threatened to sue, I advised them I was going to turn this over to my lawyer, and advised them we had sent a P MO and I was going to also get the postal service involved if they didn't refund the money. They again threatened to sue. They called my bluff,, and I didn't get MY lawyer involved,, but did turn it over to the Postal service. It took 8 or 9 months,, but we got our money back,,, and was informed the postal service had arrested and had thrown two brothers in the clink for Postal Fraud.
If ANYTHING doesn't seem right, use a Postal MO, if things go wrong, the post office WILL go after them. By cashing a postal MO, they are opening themselves to postal fraud, if it is a scam.
Tom