Is it because you guys hit this offer hard, or because you don't think Amex would do much by reviewing your accounts. Keep in mind this is the new Amex they play by new rules. What if they decide to enforce every one of their T&C going back 7 years?
ETA: I am not saying they will, or even that its likely. It is definitely a possibility though....
I for one did not hit hard, as you know many have 99+AU's I only have immediate family with same address, When i got the credit back it was for a mistake they did, I ended up talking to a supervisor in a dept. I never heard before, can't remember the name, I asked too many questions to understand the new Amex offers, in brief his answer was 1 per card member, not per SSN, for e.g if i had an offer on all my cards, as the primary holder, that once i used that offer on one card, that is the only allowed credit, if i used it on more cards, no credit or reverse charges, and as long as I as the primary used a certain offer, then all AU,s are not eligible for credit. So AU's are no longer useful.