Another scammer on ebay, what can I do?

So, in November, I went to a cardshow, and found Hines Ward Playoff auto rookie that I have been looking for, but can't afford now. Just found the exact same card on ebay (i know cause its the registered set serial numbered 4 and he was selling the whole set at the show). Having seen the card recently and knowing the sig was not nearly that clear last month and knowing Hines' sig as well as I do, I can see the hesitation marks in the card from his scan, it quite obviously the card has been wiped and fake signed to look better. Other than messaging him and telling him I know, is there something that can be done to protect the buyer?
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it did look a little hesitant though.
looking for PELLE LINDBERGH's psa and 1960 fleer baseball psa 8 and up
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