This infomation was found at Watex’s Site
All the following hidden pins in the yearbook are just for viewing and showing you past pins! You can’t take them from the book.
First, open the ‘05-’06 Yearbook in the Book Room of CP.
The very first pin is the Clover pin. Click ‘March’ to view it. Red boxes will be where to click. Blue boxes will be where the pin shows up. (The Music Note is also a pin)
Click the puffle for the Plant Pin.
Click the Miner’s hat for the Lantern Pin.
Click the Cart for the Sun Pin.
Click the Cactus for the Horseshoe Pin.
Click the Pom-Pom for the Hockey Pin.
Click the Lightbulb for the Lighthouse Pin.
These are definitely not all the pins released on CP in that year. And I like how they show you free items released that month too.