Here's a little bit of info and advice for all of you:
My brother (in the Midwest) sent his request in the day after the recall was announced. He told me about it a couple days later and I searched, but couldn't find mine. A couple weeks later, I found mine in a box and sent in a request. I received a box from Fedex 2 days later and dropped my box off the next day. Super easy mailing situation! Received the new, Silver 6th Gen Nano yesterday in the mail. My guess is that it's a refurbished one, but it doesn't matter! I got something for nothing, as my old Nano stopped working years ago and was thrown in a box, never to be seen again.
Anyways, my brother never received his box like many on the forums have stated. He had his secretary call Apple and play the waiting game on the phone. After going through several people, and escalating the situation through supervisors and managers, they finally tracked down the box. It was shipped out from Apple and was going through a Fedex or UPS facility in Illinois, and then just stopped. Since there was never any outprocessing scan from that facility, it was lost somewhere there. It wasn't that Apple was backed up and hadn't shipped it out, but that it was lost in shipping. The manager stated that they would send him out a new box.
If you really want to know where that box is, call Apple and be prepared to spend 45 minutes or so on the phone. They CAN track it for you, if you talk to the right person.