Pre-release after you have the full game question

Hey there, I was just wondering if a pre-release code could be used after you've already started playing the full game. Like, if I already have GW:EN and Nightfall, and I got pre-release codes for them after, would I still get the bonus items even though I've already started playing the full game?

Yes, just click on the "add access key" thing on the log-in screen and enter the code.