what i would do, is go to the new house, and hook up your equipment... make sure everything works
Make sure there is lines running to where you want the receviers, and that once you get them hooked up right, that when you run the check switch everything works right.
Then call and change the address. That way if the previous owners swiped the switch, or you have a bad LNB or whatever, you would still be able to do the DishMover.