How many times have you been ripped of in a car or parts deal???

Got screwed over a time or two in the past, when i sold parts on ebay.
One "buyer" put in a complaint that i send him and empty box, and no parts.
I had the postal receipt that stated package weighed in at XXXX pound, and if i sent an empty box, would only weigh a very few ounces.
Pay Pal sided with the buyer, and the seller, me, got screwed out of 75 dollars, that they took out of my account.
Had something like that happen to me long ago, sold a Dart fender and shipped it, buyer claimed it never arrived, but I had a proof of delivery, signed by them.