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Eight kilobytes? That's too small to be any image except maybe a teeny jpg. More likely it's the directory itself; some kind of minimum size.
 
I am amazed you are worried enough over 8kb to start a post.

I would guess it is the directory though, think mine was the same.
 
Obviously this was a returned unit otherwise there would be nothing stored in pictures. Probably has a light leak or yellow tint on the screen. Maybe even dead pixels.
 
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