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The pic he saw was in a GL ad a while back.
As for opening it up it is done by 2 gears at the back to open the sides out. all done by hand.
Here is a good thread so you can see more pics on it. http://www.steelsoldiers.com/5-ton-up/30647-m820a2-home-safe-now-its-time-check-her-out.html