About a month ago, my HR21 went on the fritz, so I called customer service and an appointment was made for a tech to come replace it. He came and installed an HR24, (score), but forgot to take the HR21 with him when he left. The next day, I noticed he had left it and called to let them know. They said they would send a box that I should be receiving within the next 5 days to return it. A week passed and I never got the box, so I called again. I got the same advice, they would send a box to me that I'd get within 5 days. We're now 3 weeks removed and still no box. I called again today and was told, for the third time, a return box would be sent. I'm just wondering if they are seeing that it's for an HR21 and just aren't sending it. It would be nice to know, I'm afraid my next bill is going to have a large charge for neglecting to return a receiver. Does anyone know if they are still refurbishing HR21s and putting them back out into distribution?