As far as I know AR11 has to be filed by law shortly after you move, within ~10-20 days. There is no 1-800 number substitution for that. 1-800 changes your address on your pending INS applications, AR11 is an overall "alien locator" form. I do not think that INS will make any inferances from that form about your new employer with regard to your recent GC approval. They should have a specific reason for doing that. Well, after you become USC you will stop worring about all these forms.
Great. I'll do both, thank you so much Gegemon
BTW, I also asked my lawyer, he didn't seem very concerned about this. The 1-800 ... I'll have to call because they sent me emails for both my case and my wife's (I-495). They are already approved. We have the cards and all. But apparently USCIS is sending approval notices twice, and up to three times to the same people, according to my lawyer. So, they're trying to send me the approval again and it bounces in the mail
Again, thanks a lot. Cheers!