I currently have one Hopper on my account. I'm about to move to a new address and I intend to buy a used (additional) Hopper from Ebay and have the installer set it up when he comes this Saturday. What do I need to know about used receivers? Will I have to get a new smart card? Should I have DISH run the Receiver ID to make sure it is free and clear to activate? So far, Dish has said I won't need a new smart card, but I guess I'm unsure.