I've had LOTS of packages forwarded to WDW before we arrive - deliveries from
Amazon -
Walmart -
Crocs - Gardengrocer - Vera Bradley -
Disney Store and Le Sportsac come to mind. There have been others I can't recall.
Have always received all packages, on time, every time - usually waiting for us on arrival. One trip was seriously embarrassing, they had to get a cart for us to get the stuff to the room.
I always address the packages as follows:
Example:
FIRSTNAME SURNAME - GUEST ARRIVING SEPT 21
DISNEY PORT ORLEANS FRENCH QUARTER RESORT HOTEL
2201 ORLEANS DR
LAKE BUENA VISTA, FL 32830-8424
United States
Phone: 407-934-5000
Note: Name is the name ON THE BOOKING
Date: Spell out the month and day, don't abbreviate
Name of hotel: Start with "Disney" even if that's not the official name of the hotel - better chance of speedy delivery as the couriers know exactly where to go
Address of hotel: Always use a street address - the general Disney PO Box is rejected by some parcel delivery companies due to the massive amounts of mail Disney gets.
Phone: Resort phone number, not your mobile - if the courier needs to call for delivery/direction to the delivery entrance it's better the get directions from the hotel than from you.
I hope that helps.