Seen on YouTube, several prototypes of the 1st generation iPod touch in a video.
You can see a model with a red motherboard, an EVT2 model, an iPod touch with a glossy black back (like the Mac Pro 2013), and more. As usual, I’m including screenshots instead of embedding the video to keep a record in case it gets removed.
On the side, we also likely see a prototype of the Apple TV remote.