Whew, that would be a LOT of work! But not for now, I posted in the avatar section, so it's mainly avatar stuff. You'll see some exceptions, like the New Years theme and Ambassador picture pack. That's why I called it 'hidden items'.
Hmm, I've been in to Avatars for a while now & still don't know how to tell if an item is region locked? lol, but if your thread is for ALL hidden Xbox.com Items, you may wanna expand if your gonna include DLC's, Theme's, Gamer-Pics etc
It's slightly different. I only post items that have a marketplace link and I don't post much info on how to get it or could've been obtained. So it's still two different topics in a way.
I just noticed there's a female version of the 404 as well. difference is that the F is for US only, while the M is international. So I guess this was never meant to exist for the public.