On the chance that I think the OP might want to know where they are so he/she can replace them, I'm going to recommend checking out the app Candybar from www.iconfactory.com, it'll let you replace those icons and tons of other system and application icons.
one more question. I found the .icns files but how do i apply the image to a folder? When I do "get info" on the .icns file it just shows a generic document icon.