postal money order is covered, wow. i was burned three years ago for 700.00 from a postal money order and still have never received anything. and i filed every complaint under the sun. if someone signs for the letter big deal. once the check is cashed its up to them to do there part or your burned.
in my opinion go with your gut feeling, kinda like should i pass here or on the back straight. lol. no really get phone numbers and call the guy, his address and i would use paypal or ask for ebay feedback.