8GB 4th Gen Yellow Nano - Syncs, appears to be fully functional; short battery life
8GB 4th Gen Purple Nano - Syncs, plays music/audio; bad backlight, controls do not work
8GB 4th Gen Purple Nano - Blank LCD, seems to be stuck in iTunes recovery loop
8GB 4th Gen Silver Nano - Syncs properly; shuts off when removed from power source
Pictures #3 and #4 also show the condition/functionality of each unit.
They may have additional issues, but all known issues are are listed.
Thanks to all for looking, and take care! Cheers!