It's definitely 3G; it says that when you hit the menu button when wireless is on. It is also definitely the US version, based on the serial number. The residue is exactly what you have described it as. I picked it up used a few months ago; the previous owner had attached a sticker on the bag which I carefully removed. I have been carefully washing the area to get rid of the remaining residue. The machine works very well. The primary reason for me selling it is the fact that it is simply too large to accommodate my reading habits, which tend towards reading while hiking and exercising.
Luqman
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