Personally, I would bid. Non-paying bidders happen all the time and that is why he said he's relisting it. I understand why sellers make the buyer private, but when looking back over feedbacks it does get kinda confusing. 3868amy seems like a real buyer (and not a friend) -- she has sold a couple of Kate Spade bags in the past but also accepted a return on a Cole Haan wallet in February...
The bags he sold are authentic.
That said, I'd bid keeping in mind that he has VERY low feedback and the ol' "bait and switch" could possibly take place. He's not an established seller, IMO. But often times authentic items can be picked up at a good price because of that.
You pay your money and take your chances! The possibility of getting cheated is always there... Pay with a CC through paypal if you win.