My credit denied
I posted back on Jan 27 that AMEX said that the credit would be manually handled. Since it had not yet appeared, I phoned again today and was told this time that the credit had been denied, because the conditions stated that, to be eligible, it had to be "a purchase of $500 or more". Mine was posted in two pieces for the one stay.
Of course, if I had been on the ball, I could have topped it up with a gift card or got the hotel (Montebello) to credit the advance charge and bill the total (including on site purchases) in one new charge.
Caveat Emptor I guess, and I strongly suspect that I am not the only whose credit has been denied, and it is a sorry reflection on marketing ploys by either or both of AMEX and Fairmont.