Series 5 of the Treasure Book was released on October 19, 2009. It could have been accessed by entering a single-use unique code from real-life series 5 merchandise into the Unlock Items Online page. Each code entered allowed the player to select any two clothing items from this series of the Treasure Book to redeem for their account. Any color of puffle up to white could be adopted as well (if the player did not already own the maximum amount of puffles), and adopting a puffle counted as one item.
The clothing items redeemed from the Treasure Book were all their "unlockable" versions (signified on their icon with an opened padlock inside a blue circle), and these versions could be freely worn even without membership. Any color of puffle adopted could be interacted with and walked without membership was well.
On October 4, 2011, series 1 through 13 of the Treasure Book were removed. Since then, if any applicable code was entered into Unlock Items Online, only the most recent series of the Treasure Book was accessed.
Items in the tables that are marked with green backgrounds are items that were first released in this series. This only applies to items that are completely new, not previously existing items with new unlockable versions.
Although the Red Ski Goggles were first released in series 2 of the Treasure Book and returned in this series, they were not labeled as an exclusive. The Red Ski Goggles ended up never being available outside of the Treasure Book.
The Santa Suit and Snow Fairy Hair, Wings, & Dress were all first released in this series of the Treasure Book, despite not being listed as exclusives. A few months later, these four items would later be available during the Holiday Party 2009 or in the December 2009Penguin Style catalog.
This series and series 13 are the only series, prior to the Treasure Book's restructuring with series 14, in which none of the items that debuted on their Exclusives pages were later available outside the Treasure Book.
