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davidcyclebackA good general rule is is you don't know how to authenticate, or at least fairly judge, the material, it's bet not to spend lots of money on items. An exception is when the seller is someone you know to be reliable and knowledgeable, which is not the case here. There's a difference between taking a wild chance on a $20 item and cards potentially worth several thousands. I don't know how to identify Ming vases, but I don't buy Ming vases so it doesn't matter.
If this situation is the impetus to learn learn about how to judge the authenticity of old cards for potential future purchases, that's great. Maybe next time a situation like this comes around, you'll be ready. Personally, I enjoy learning how to identify and date items and i.d. fakes-- that's half the fun for me.