We really need to see a clear photo of the creed patch in order to authenticate a bag, and bidding on a listing without a good creed photo is never a good idea. Can you ask the seller for one?
BTW, I'm not sure what kind of "stain remover" the seller thinks will get rid of those stains on the back, but using most stain removers on a leather bag is NOT a good idea - you can take the color off and leave the stain there. Usually whatever marks or stains are on a bag when you buy it, they're going to be there for a long time.
I'm also wondering about the "brown tote" the seller just received Feedback for, and if it was just designer-inspired or if it was a ripoff of another brand - Aigner, maybe? Hard to say.