I checked around the seller's pages a bit. There's only one of them for sale, which usually isn't the case when selling fake bags, in my experience anyways, and they have no negative feedback citing fake items. To be safe I would contact the seller asking if the pictures on the auction are the actual bag you will receive, and as a sidenote clarify with the seller that authenticity is guaranteed with a full money-back guarantee.
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"...If I know my supermodels (and according to the half-dozen or so draped across my bed in a jenga of crack-glazed longing, I certainly do)"