Seller boutiqueofluxury has a fb from buyer saying it's an authentic Hermes piece. Too bad the auction is private so we can't see what it is that she sold. Perhaps confirm with the buyer. If the seller is legit, then I say the vibrato is a good deal indeed. Ppl might be weary buying from her coz of her low fb, therefore not bringing too many bids, which is good if you're really interested in the bag. She also has another fb for selling a LV.
I have had success buying a birkin off of ebay. Found the auction on ebay, but we settled on doing it off of ebay instead. Not only I found myself an authentic Hermes birkin, but I found a new friend too, seller turned out to be a very nice girl.
Just sharing one success story of buying a birkin from ebay..