Three? The description only says two. Are you sure it's for all three?
From the description on xbox.com
Content includes “Crimson, Majestic & Castle Map Packs” plus 2 in-game helmets and an emblem at a special value. If you own this Map Pass, access map packs thru the Halo 4 in-game store. Do not download from Xbox LIVE Marketplace or you will be charged twice. Halo 4 game, 4GB storage, & Xbox LIVE Gold membership (each sold separately) required to use this content. (Map Pass included with Halo 4 Limited Edition.)
Haha, wow I'm dim today, I missed the comma... Thanks all!
It is my opinion that Halo is the best thing to hit gaming since the creation of games itself.