This secret can be obtained without even starting the game. You must have also
bought an official copy of the game. You cannot see this secret if you have rented
the game or burned a copy. On the game case cover, you can see the title and the
game summary. If you turn the game case cover inside-out, you can see a
completely different cover. There will be text at the bottom of the cover. If you
read the text, you can see a prompt sent by Gabe Logan. The text shows different
kinds of weapons that can be found in the Carthage Mission. (first level).