I'll answer a bunch of various questions in no particular order (I skimmed the thread

):
(1) Dish network only wants the equipment back if you "lease" it (most of the installs done in the last 3 years (give or take) ). Most installs done before that, you "own" the equipment and they don't care what you do with it. They only way to know for sure is to call them or to check the original contract you signed (you "should" have been given a copy).
(2) If they want the equipment back, they want: All Receivers (the box), all dish network remote controls, Any switch (you may have one, you may not, most are a large silver box (6x6x2?) that all cables hook up to, generally at the dish, in the basement, or near where the cables come in the house), and last but not least, the LNB if possible (also known as the eye(s) of the dish, the thing on the end of the dish, etc. Can be as easy as 1 phillips screw, or as complicated as 4 phillips screws + 2 10mm bolts depending on the dish and assuming just 1.
(3) Phone Lines: Any single tuner does not need one unless you want to be able to order PPV (or use the interactive stuff I think). Examples would be: 311, 301, Legacy equipment (4 digit model #s), etc. Any dual tuner does not "need" one BUT if it doesn't have one hooked up at all times then Dish Network charges you a $5 a month fee for the "2nd room" (whether you use it/have it hooked up or not). Examples would be: 322, 522/625, 722, etc.
(4) Activation/Deactivation: Everything is computerized and controlled from their end, they use the receiver # and smart card # to enable/disable what you can/cannot see. The smart card is "Married" to the receiver and then given "permission" to access the channels you pay for. Cancel the account, they send the command throught the sat to the receiver to deactivate itself (rumer has is, Immediately, then every 24 hours for a bit, and then every 3 - 7 days just to make sure they got it

)
I think that covers everything I saw, LMK if you have any more ???s I might have answers for ya
WTT