I am glad the OP didn't get taken by spending money on a fake; the board should be all about helping collectors learn more, and there is plenty I don't know about the hobby.
But I am always at least somewhat surprised when new posters come on here and ask if raw high-dollar cards like a 52T Mantle or a green Cobb T206 are real. There is a reason cards that would be high dollar cards like that are being sold raw. Chances of finding some amazing steal of an iconic card are very small.