You do need to get the cards graded and authenticated. If they are real they will sell for far more if they are graded.
As far as which auction house to use, nearly every auction house out there shares the same pool of bidders. Your cards will go for roughly the same amount in any reputable auction, large or small. The size of the auction house will not impact the price realized. The only thing I would stay away from is grouping your cards together. If one house is willing to break your E93's into single or small lots, while another only wants to sell them as one lot, then I would go with the one who is willing to do the extra work for you. But again keep in mind they all have the same people bidding. Nobody has that secret bidder list; it doesn't exist.
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