You're browsing the GameFAQs Message Boards as a guest. Sign Up for free (or Log In if you already have an account) to be able to post messages, change how messages are displayed, and view media in posts.
TC, people were trading/duping the preorder heads/skins long before the preorder stuff was up for sale on the marketplace. It was the only way to get them--and is a side-effect of them being in the game code the way they are.
Concerning the new heads/skins, I don't think they'll be dupable/droppable, at least on xbox. I've used save state editing in the past and to my knowledge there's no account of the heads/skins being in the game via Gibbed. Even if you could make a droppable unlock for the DLC heads/skins, you should still need to download the files to show them, which is probably not going to happen unless you just bought them to begin with (or had a hacked/modded BL2, which is much easier said than done on xbox).