You are making my brain work hard here but...
My first Kooba Scarlett came from Surf*Goddess who has her own high end boutique in Hawaii, then I returned to buy a Botkier from her also. Nice seller.
I bought my Marcelle from Ali-Babe. She was great to deal with.
And I got my IF Audra from Upscaletrend.
All of these sellers bent over backwards to assure me of authenticity, answered all questions (and in some case alot), pictures etc. They have impeccable high feedback and deal mainly in high end bags. Their prices are not 9.99 or even 199.00. But I believe the main rule on Ebay is "You don't get somethin for nothin", and if you think that you are probably at risk of buying a fake. All of the bags I bought were over 400 but that was still alot off retail price.
I remember looking for my first Kooba and out of 35 listings of Scarletts, Surf*Goddess was the only authentic one. How can people sell Koobas for 99.00 that retail for 600? Another ebay purse forum advised me that she was authentic and others had had dealings with her. So then I started my own research asking questions of where she got them, etc. Her open honest answers were refreshing and reassuring and in return I got a beautiful bag.