Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - General launch day steam install instructions for backers?

For Steam Early Access backers who have purchased the physical collector's edition, I expect the process to be this:

1) Receive physical CE.
2) Open physical CE.
3) Observe useless physical CE game code that can not be added to Steam because you already own the game on Steam.
4) Apply physical CE DLC code to Steam account to upgrade SEA copy of game with DLC goodies.

My only concern is with #4 - since so many SEA backers are experiencing difficulty adding the digital DLC to their accounts, I'm concerned about running into the same problem when attempting to add the DLC code included in the physical CE box.