I was wondering this because I play the game. By book codes I mean the Club Penguin books you can buy and unlock items from entering a word from the book on Club Penguin. Thanks!
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The club penguin items in catalogs are for members but when they update new stuff there are items for penguins without membership and for the books you can search in web for the words and when you unlock a book it will give a book or some coins (2000 coins) i hope i helped you
No, you can use them.
You just can’t use the gift shop clothing.