This is less authenticating a bag & more the seller...this just happened today and I'm afraid to go through with this now, you'll see why..... Hopefully it's ok for me to post this here...
Item: Authentic coach brooke perforated leather handbag EUC
Seller: wanaka (only 11 feedbacks, 1 as a seller)
Link:
http://www.ebay.com/itm/120903453280?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
I've been casually looking for a white/silver perforated brooke and found this one. I can't see the scratch mentioned in the description in the photo, but for the price thought a small scratch would be no big deal. Because the seller doesn't have much feedback, I did ask a couple questions, one being the color of the interior.
Me: can you tell me what color the inside is?
Seller: here is a picture of the inside
http://i49.tinypic.com/28hkl89.jpg
At this point I am sure it's the right bag, but checked the other auctions that are currently up for the same bag, and recognized the photo - it is EXACTLY the same photo, the shadows/lighting, the folds, the positions of the zippers, the cropping, the black leather something in the background (upper left). Here is a link to the OTHER auction I'm talking about: (see 5th picture in the description)
http://www.ebay.com/itm/290674132354?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
So I figured, maybe they are just sending me this photo for reference, which would be OK. So I politely asked another question:
Me: Great, thank you!! Is that a photo of your bag, or just a picture for reference to show the inside?
Seller: I took it of my bag
Great, I didn't expect that. Now I'm uncomfortable. Still trying to give them the benefit of the doubt, I politely ask another question:
Me: The reason I asked was because I see the same exact photo in this auction, is this your auction too? (I wouldn't mind if you had used a picture other than your own for reference, because sometimes it's easier than taking your own photo) (then I linked that other auction)
Seller: no but it is the same bag so in pictures they will look alike.

I studied these 2 photos, it's not even possible - the only difference I found was that there is a tiny black spot on the other person's auction that was possibly photoshopped out, and has been resized smaller.
What should I do?