Reckk,

The one other time I saw this was due to a student overfilling the backpack causing the laptop lid to be compressed into the keyboard. The movement of walking to and from class was causing the lid to rub.

well  few of the pics it almost looks like the protective plastic  film is on and its bubbleing/peeling off but im sure thats been long removed and other picture looks like dirt is getting  in, if you look at  picture

behidn the light up keyboard you can see the dirt and sand particles, its possible  this could be causing the issue since it is present and visable....

other question would be is there any visable marking or such on the screen in the low area?  

as for the smudge marks, with my R1 and R2 it  did the same during transport and it seems since its so close when closed the oil off your fingers when touching keys  stays on keys and when closed transferes to the screen when  any compression is done.

i know the R1 and R2 were heavier and so was the screen backing ....