You have to book that code before you check out of the hotel. Once you check out it is not valid. (It was not any better than the public codes offered now)
Here are some codes offered at mousesavers.com
Fall/Winter Savings of up to 40% Off
Stay dates: 10/3/10-11/23/10, 11/27/10-12/25/10 and 1/1/11-2/16/11. Get a 25%-40% discount off regular "Rack" rates for 2010 or 2011. Percent off varies by resort type. Use code CM5 or AK9 for 2010 stays; code MM2 for 2011 stays. Some dates will be blocked out. Rates not available for all dates and resorts.
Save 25% at Disney Value Resorts and Animal Kingdom Lodge
Save 30% at Disney Moderate Resorts and Grand Floridian Resort
Save 40% at the remaining Disney Deluxe Resorts
Save 40% at Disney Deluxe Villa Resorts
About Booking
You must book by 11/21/10. For phone bookings, you pay a deposit of one night's room rate plus tax. No change or cancellation fee will be charged if you make your modification more than 5 days before arrival. Thanks to Small World Vacations for info.
To reserve a room with the Fall/Winter Savings, call the Disney Reservations Center at (407) W-DISNEY or contact a
travel agent who specializes in Disney travel, and request the specific offer code.
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Check the WDW websited for promos as well.