FINAL FANTASY XIV: A Realm Reborn Purchase Questions

[PortableFishy]

Users who purchased and registered the FFXIV version 1.0 Collector's Edition, the bonus items will be sent by Mog Letter without having to input any additional codes.
Users who purchased the FFXIV version 1.0 Collector's Edition but did not register the code will need to input the Collector's Edition registration code.

Does anyone know how to check if you've entered in your Collector's Edition registration code?

[Kishin]

I haven't seen anyone ask this question and I really want to make sure of the answer before I make a purchase. If you have a legacy account and you purchase the Hard copy of the CE, can you use that code on your legacy account or do you need to buy the digital upgrade to be able to apply it to your legacy account?

[Sorbet]

Does anyone know how to check if you've entered in your Collector's Edition registration code?

You can check the Square Enix account management page to see if you registered an onion helm code, unless you purchased/received it from a third party. Other than that, I've seen no way to differentiate.