After reading up on this issue, I realized that the code that I got from Amazon was not the correct code for the collector's edition of the game, so I registered the code that came in the box on the PSN store which unlocked the CE content. I was told to restart the game client and re-login to use the new content, however it wouldn't let me use my existing service account so the only way to log in was to add another service account which I don't actually need...but has the CE bonus content linked to it. Can I just have the PS4 CE in my current service account and kill the new one?