While I won't rule out that this card could be a fake, that picture does NOT show a GPU core between the two fans: the chip shown there is a CrossFire bridge chip. The actual GPUs are packaged a bit differently; for the past few generations, the chip has been mounted diagonally, rotated 45 degrees from its packaging, and in a MUCH larger package than shown. As an example, Take a look at
this pic of the 5870 with the cooler removed.
Granted, this doesn't explain away some of the other inconsistencies, such as how the PCI-e plug doesn't seem fully parallel with the board's edge, and likewise, how it appears to be missing the ever-present "AMD" logo that goes on there. (right below where the site put their own logo)