When Blue first came out, Amex had an employee who kept phoning us to get us to convert - to which we kept saying no. After a while, we got a phone call from a differerent employee wrt to 'our' blue card (that we had never seen). It turns out that the first employee was bent, and had signed us and a few other people up for a blue card anyway with a different address. Amex had caught on to them somehow, and were working with the FBI. They were phoning everyone who they thought may have been hit.

Never heard anything more about it beyond them changing our regular Amex card numbers to further protect us - no bills, no negative credit references etc, so they sorted it out satisfactorily.