Well basically I think if you go to where the quest is given (at the bottom of the chain from the elf on the way to BRD), and if you can take the quest, you're not.  

If you have the quest you're obviously not, and if you cant take the quest I'm guessing you are.

Also you could start a raid with just 2 people and see if it lets you use the crystal and get into mc (maybe you have to have more than 10, I'm not sure).  If it does, you're attuned.