If it makes you feel any better, all but one of the iceBooks I've purchased from eBay had no less than three replacement Ethernet ID stickers under the keyboard, while some have had more.

The 500-700MHz models are the easiest to reflow, with the 800-900MHz models being more difficult due to the use of discrete RAM chips mounted to the GPU's package (previous models' RAM was integrated into the GPU itself). I've succeeded with the heat gun trick on three of the discrete RAM models, but two were ruined when the weight of the RAM chips crushed their solder out from underneath them. That was a disappointing experience both times.