the other box needs to be "staged", (a program to load the channel mapping, and lineup into the box), and refresh it. this action is done in the headend, or near a network with a dac setup.
when the box was removed from the service, it more than likely was shut down. it needs to be re-staged now, and is now a missing piece of equip. most dct's cost the sub around $200 if not returned, and are property of the cable co. from which it was removed.
without the proper program, its useless, and is again, the property of a cable co. somewhere.