I agree with Richard that proving damage to the collecting community at large would be much more of a long shot than getting together a group of buyers. Though how would you go about contacting those buyers? If you got the first one on board, could you subpoena their bidding records in order to contact others? (This is me thinking out loud, but not being at all sure about the legal process).
That does bring to mind the question of if/when these forgeries have resurfaced elsewhere in the hobby. Not necessarily through other reputable auction houses, but more likely on eBay. Anyone seen them offered? Or are they still hanging on unsuspecting buyers' man cave walls?
Personally, if I was the victim and innocently trying to flip the item for profit, I would rather be invited to join a class action suit against the auction house/authenticator than just a rude e-mail telling me my item was fake. (Not sure if that makes sense reading back over it, but hopefully you get my meaning).
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