Here is response that I got from amex about 50k miles
Response (Andrea DaSilva) 04/27/2011 03:41 PM
Dear xxxxx,
As previously advised, I can only receive emails through this secured messaging system and there is not a email address available to contact us, other than this system.
Regrettably, even though the link was still showing as available, the offer had expired on 03/31/11 and it was not extended. The link had just not been removed, and the valid dates should have been on the offer in the details.
I apologize that I could not assist you today.