I sent an email to se about this but didn't receive a reply. I imported FF13 specifically for the ffxiv item but I'm not sure if it will work on an NA ffxiv account. Anyone else in the same boat, or know something I don't?
Edited, Jul 14th 2010 5:11pm by ImmT
Have you not yet received your XIII copy then? If you have, you should have gotten a little red/black card in the box that has a promo code.
All I can say really is to punch that code into the SE Members site and if it works, it works. If not, I'd contact SE (again). Of course, there's no guarantee that your XIII copy will even contain a promo code. Those were pretty limited in numbers.