I would honestly like to assume that if it's as simple as doing -math- for a player to determine whether an item is hacked or not, whhyyyyy is it so difficult for their software to do this -for- us? No really... Because I'm sure, that most people have -no- idea they're buying illegitimate wares and are just honest players, who after being banned for malarky like this, aren't very likely to buy from them again...
That said, if you'd like to add me on steam, I might be able to help you out to some extent. My username on steam is Qwert1484, feel free to add me.