I apologize for the blurry image, it was close to 10 years ago so there were almost no pictures of the event left. If you look in the bottom left corner, you'll notice that they gave hints towards where the item was. For example; the hint they gave in the picture lead to the piano in the Club Penguin Pet Shop. There was a hint for each item.
You'll notice there's also a Claim Prize button. After the hunt was completed, you could claim your prize which remains one of the most rare backgrounds in Club Penguin history to this day. It was known as the Band Background and was for both members and non-members.
I love the classic old school look of this background, and it's unique because it doesn't have every member of the bands signature on it like all of the newer Penguin Band backgrounds. It's simply signed The Band. It truly is a special background, and remains the rarest one to this date.