An email I just got from disney had both of those addresses in it:
"Final Payment may be made by phone with a valid credit card, or check payments may be mailed to Walt Disney Travel Co., Inc., P.O. Box 409668, Atlanta, GA 30384-9668. For payments sent via overnight courier, please address to Bank of America Lockbox Services Lockbox 409668, 6000 Feldwood Road, College Park, GA 30349 (407) 363-0029. Please include client file number on check. Thank you for choosing us as your travel partner."