If I buy a used direct tv sat box, what happens? Does D tv have to activate it to my account? Can I swap my existing card to the new one? Will D tv charge me a $5 fee per month to have another activated reciever? Can I keep my leased reciever while owning a used one? Im trying to get another to use at my cottage but know know how all this will work with the 2 active boxes I have now at home. Thanks much. BP