As a point of interest, I once purchased several items from a merchant at a well known web storefront- not Renderosity, PoserPros or DAZ. For some forgotten reason I had occassion to contact the merchant. A month or so later this individual contacted me asking for details. It seemed that the storefront records did not show any purchases of the items in question during that period. I'm sure this was the cause of oversight or system glitch rather than ill intent and have no idea if the matter was ever sorted out. But this does suggest that such records are not irrefutable evidence of legitimate purchase.