Have you considered looking outside the game? What do numbers like that usually mean? As for the other realms, those blue boxes only exist there.
I still don't get it
PM me using the contact form on www.fluttermind.com (it avoids spam-bots) and I'll be much more specific.
The blue chests are no secret though. They only show up in the hidden realms and contain spells you can't find elsewhere.
