It is my understanding that the resort does not know of your ressie until 4 days prior to your arrival. You could fax or call at that time and talk to the room assigner.
I called to confirm this trip two days prior. They were gracious about my confirm, but I got the feeling they didn't understand why I was calling. It sounded as if people don't make it general practice to call there and confirm.
In all of my trips, this is the first time I confirmed. I used a different travel agent and I just wanted to be sure.