Only on a MacBook Pro or PowerBook. Not accounting for 3rd party accessories: iBooks, MacBooks, Apple’s Mice & Pro Mice, Mighty Mice, Apple’s Pro Keyboards, Apple Keyboards and Apple Remotes were all plastic at the time, and mostly white or translucent plastic with a couple of exceptions.

The aluminum stuff all came about just immediately prior to (about one or two month’s prior) or after Leopard’s release, but Tiger’s era (and Brushed Metal didn’t start on Tiger) was dominated by plastic input devices.