When I cancelled my Virgin cable service they said I didn't have to return my cable box (NTL badged). Is it safe to sell it with the viewing card or can someone tamper with the card and create some comeback to me?
It's not really yours to sell. Virgin seem to be reluctant to pick up old boxes. I cannot legally be used by anybody else. I think the best advice is to cut up the card and send the box to the local tip for disposal. That way it should not fall into the hands of anyone who would try to make illegal use of it.