If you're like me, you could probably give a **** less about Early Access and more about in-game items. Well, if you ordered from Amazon and just happen to receive a bad code like me, rather than go in circles with Amazon Customer Support, cancel your preorder and re-preorder it. You'll receive a new code within a minute.
I spent the last two days with Amazon trying to get them to send me a new code when I finally got fed up, cancelled the preorder, and felt guilty and re-preordered. It only charges your card once it ships, so no loss to me.
Heck, you could probably farm preorder codes that way.