From your experience, how long did it take to receive the 'room only' yellow confirmation from CRO? Can the confirmation be faxed by CRO without charge? It has been about 3 weeks now.
I woud think that normally you would be getting it right about now, however with last weeks events, I am sure the mail coming from the US will be slower. If you are really concerned, give CRO a call and they can verify the reservation for you.