I don't know, last time I did a money order I was scammed $600 by a very trusted 7s seller Devil D0g. He was a 3 year member, staff vouched and 2500+ posts. I learned a valuable lesson from that whole ordeal, no matter how trusted they are there is always the possibility they could loose their ways. I would highly recommend you think long and hard about whatever you're trying to buy and I would not recommend it.

If you're using a money order it would be stupid for them to attempt and scam you because you would have their name and can just sew them

I suggest using paypal and sending as goods