When I started selling, I wanted to be Paypal only. I decided to accept USPS money orders only as a distant second in order to pick up a few more sales. I had a bidder win an auction that violated a couple of terms about contacting me. They contacted me after I sent an invoice saying they wanted to pay via money order. I sent the address and once again stated clearly that I ONLY accept USPS money orders. It showed up today, and it's not a USPS money order. What should I do? It's one that I've heard of being faked in the past.