How do you prove something was a shill bid? Can't the suspected shill bidder -- even if a competitor auctioneer or dealer -- just come back and say "Well of course we all follow each others' auctions and try to steal things at low prices if we can. I would have taken that Mantle card at $10,000 happily. . . . I suspected others would come along and far outbid me but crazier things have happened . . . ."
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