All of the scanned material present is from the following sections:
http://www.mobygames.com/game/half-life-2/cover-art
http://www.mobygames.com/game/windows/half-life-2-collectors-edition
http://www.mobygames.com/game/windows/half-life-2-gold-edition
http://www.mobygames.com/game/windows/half-life-2-holiday-2006-collection
The electronic XBOX coverart is from:
https://www.gamer.no/spill/half-life-2-xbox/29825