I've arranged for the second return of my 700 today. Over ~1.5 months the dust became worse than it was on my first reader. The representative I spoke with said that this issue hasn't been widely reported, so apparently I just have some really bad luck. I was very careful to really baby this unit, so I was surprised it ended up being worse.
I'm 99% sure the dust is coming in through the seam between the aluminum and gray bezel. When my replacement arrived, there was some slight condensation along the top edge inside the screen. In the attached picture, you can clearly see the light through the top seam and that the dust mainly accumulates along the top.
I have a few more .lrx files to finish, so I'll see how #3 treats me. Either way, I think I'm going to cut my losses when I finish and make a flea market post.
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