Originally Posted by
ESpen36
1. Don't worry about it. I've used GE many times and have never been asked to show my sticker. Incidentally, I'm in the same boat as you--a NEXUS member who got GE membership via GOES. I went to a CBP office to pick up my sticker and the officer almost giggled at me as he handed a couple over. It made me think that they don't really check for them, and IME, they haven't.
Under normal operations, the sticker is not needed. However, as has been posted in this thread a couple of times, when the kiosks malfunction or spit out an X receipt, having the CBP sticker is what allows you to skip to the next available CBP processing station without having to go to the back of the line.