They gave them out when Club Penguin first started doing mail.
You get the code from any club penguin book.
you must get a club penguin book or go on to youtube.com and search how do you get a book on club penguin. i have got a book if you sit down with the book you will be reading by the way the blue book is a clothing item
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by having a club penguin book and throughout the book there will be codes
the ulitimate guide to club penguin is a book you can find this book and other great club penguin books at toysrus.
what you have to do is buy a club penguin book and go to club penguin and log in then hit unlock itemsclick i have a book and answer the queston.
Like a club penguin toy or book.
Go to the pizza parlor and get the money bag
Jew-Pan
80 pages in one club penguin book CL
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You have to buy Club penguin toys, clothing, figures, or books, or any Club penguin things, If they do they'll come with a code, which you will have to enter on Club penguin to get the treasure book. Hope this helped!