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I might agree with the above two responses, probably the card numbering. However, I think that would only apply if it was reading pre-existing data from within the D800E playback folder, or it (playback folder) was deliberately set from the default "D800E" to "all" under playback menu/playback folder. So you would probably have to already have D800e data on the card.
I'd be thinking maybe it was used as a demo at the store, without a card in it which also will increase the real shutter count (tested this on mine).
Take a jpeg, download it. And look at the exif as others have said. compare with the shutter count:
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From My D800e:
Total Number of Shutter Releases for Camera = 15627
(Nine positions from the bottom using opanda)
(Note the camera resets at 10,000 clicks also)
It's extremely rare for these two numbers to stay the same, almost impossible.
D5 will also reset the image numbering. It can be set to reset each formatting, or left on (to accumulate).
Regardless, every new camera I've bought starts with the numbers matching, so something is weird. But I also format my card in camera before taking that first shot. Don't know if you did that.