Not trying to cause trouble, but to clarify. If you need the code from either the box or what Origin sends you on the 16th... and these are the only two ways to get it... How are people already in early access?
Or is that code essentially to let you 'start playing' fully when the game is released and you can access your early access regardless when they actually give you an invite?
That's the code to let your start playing fully. The pre-order code you entered previously is just that, a code to give you a place in the pre-order queue. Once the 20th launch happens and you haven't entered your code you cannot play until you have.
It's also the reason Stephen Reid has been pestering retailers to try and give us an indication of when deliveries will happen.