Yeah I mean even though you got a TWC but I would agree to what you said.
He won't have sold it if it was a dupe and he would have just made bank off it.
Probably just another hoax. Or some way to scam people's money.
And @ TS, if you know how to dupe. Just dupe your own money and sell it on here. Rates are as high as 1:20 to OSRS. Do so and maybe we will believe you.