I followed Ali E.'s suggestion and emailed the registry address (registry@ngccoin.com) and received the following reply:
As a newbie, I'm not really sure what that means. I suspect that the registry is actually a coin database where people get to compare their collections against others' and see who has the nicer collection. Judging by this, I'm guessing my coin probably isn't worth enough to bother with.
I'm not terribly worried about it - I'm not looking to compete; I just want to make sure that my coins are actually authentic.
I'm interested to hear any info anyone else may have on this topic. Thanks, everyone!