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runscottThere are, give or take a few, 524 cards in the t206 set, easily the most widely traded pre-wwI card set. This Mathewson reprint did not come from one of the other, less common sets that you refer to.
If someone plans to buy HOF t206s, or to get into the business of grading them, there is no excuse for not being able to tell a fake from a real one. If you can't, then you should either educate yourself on the issue (which would be simple with t206s), or stick to what you know best.
You can make excuses for these people all day, but the task they had was relatively simple compared to that of selling/grading most other issues.