Hi,
I just found this thing on Ebay https://www.ebay.fr/itm/Nvidia-GTX-1070-8-Go/263780476580?hash=item3d6a8aa6a4:g:ou8AAOSwmtBbMhZ7 for only 200€ (449.90€ is the cheapest 1070 in brand new) The model number is PN-288-!N445-101A8 (on the back of the cooler) can some say if it's working like anormal 1070 or not (if you have one) or just if you think it's look like a real 1070.
Thanks