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samuelsal bando's rookie is one of my favorite cards.
if I were you I wouldn't worry about backing out of the deal. why should you honor it when the other party tried to mislead you? this weekend I backed out of a deal for the first time ever. it was a very small amount of money and I feel horrible about it. I had fair reason, but not nearly as much as you do.
on collecting autographs, I wouldn't worry about authenticity unless you have reason, as in this case. even if two companies authenticate it, it could just be a brilliant forgery. it's the nature of what you're dealing with, and if you enjoy it enough that shouldn't stop you. in all likelihood almost all of your signatures are real, and simply doing your best to ensure that should be comforting enough.
good luck.
edit: I forgot, it was an auction company. maybe not a case of misleading, but I guess the consignor would be benefitted in consequence.