Its just more of a risk buying a car like that i guess.. But heres the thing, you rather the car like that, than the owner putting on the stock rims and pretending that he never had 20'' rims on it. Because if he's lying about the rims, he is probably lying about other things.
So the truth is, it doesnt matter who it looks like drives the car, what wheels it has on it, what sticker or mods or anything like that. Do your tests, get the car looked at by a pro or even better would be a current owner of one. If your not careful enough you gonna fall in the trap.