Rockhopper's Key Pin

Rockhopper's Key is a pin in Club Penguin Rewritten. It is hidden in the last page of The Journal of Captain Rockhopper in the Book Room, and all players can obtain it. This pin is needed to enter the Captain's Quarters on the Migrator.

Riddle
So ye want in my Quarters? Well I've hidden the key! It's found in an item That's personal to me. Now don't despair, The riddle's easier than it looks Just go to a room That's abound with books!