Convert to HD

When we bought our HD TV 2 years ago, it came with a free digital converter box that would allow old analog TVs to be converted to HD and viewers can watch high quality digital TV broadcasts for FREE. Had we known about this, we would not have given away our old analog TV. I guess I better just put this on my ebay account and open it up for bidding. I just do not know if there would be someone out there who is willing to buy it as most people have already converted their TVs to HD.