Why cant i find any of the silver skulls on halo 3?

[David]

Iv gone through the game and found all the gold skulls: Fog, Famine, Tough Luck, Mythic, Tilt, Thunderstorm, Iron, Black eye and catch. I now need to find the 4 silver skulls but when people are showing me on the internet they are in the same places as the gold ones and when i go to pick them up there still gold and nothing happens. does anyone know how i can get them or know why it isnt working?

 

[Tom]

They are not in the same places as the gold ones.... you must start from the beginning of the level and you must be on normal dff or higher.

http://www.youtube.com/watch?v=WlSWOB3MhIg

 

[Haywood]

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[calamity.]

You probably already have the skulls and the reason nothing is happening is because the silver skulls don't unlock achievements. Go into campaign and press X to view the skulls you have.