Just got mine - this Saturday - which is just over two weeks before we go.
All you get (if you booked direct with Disney like we did) is a confirmation letter re the accomodation (just after you book it) and then for the EuroTunnel a letter with a reservation code on it (two weeks ish before you go). Use this code when you arrive at ET.
Hopefully will be nice and easy - will let you know when we get back how it went