Dismantle the giant magnet on the roof of the building.
Mission 3? You can see it on youtube.
it is 3568
On the ceiling of the vault because of a giant magnet caused by Herbert!!
See the related link.
Just Go To This Website For A Full Guide On "How To Complete The Case Of The Missing Coins - Mission 3" The following is NOT a link http://www.club-penguin.org/club-penguin-mission/club-penguin-mission-3-case-of-the-missing-coins.html
It is different every time you go on the Missing Coins mission in Club Penguin.
There is no way to get 100000000 coins on Club Penguin.
For Mission 3, go back and talk with G.
In G's droor
Search on Google for 'Case of the Missing Coins Walkthrough.' The best ones are youtube videos
Yes there is a secret mission on Club Penguin.
nail two pieces of wood across the the out side of it.