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identify7Howard: If you follow DR Cycleback's advice, you will eliminate most cards which are not authentic. Briefly, his advice includes the fact that it is often more easy to determine the faker than the fake. Specifically, by avoiding potentially high risk sellers, you minimize your exposure.
Check their feedback, their presentation (such as unclear scans), strategy (such as private austions), terms (such as "all sales final"), etc. and you will eliminate 95% or more of the fakes.