This was a 'Special Edition' version of the God of War demo disc. This version was only mailed to members of the PlayStation Underground that signed up for the Special Edition Demo program. It came in a custom printed heavy envolope (notice in the pictures at the bottom that the inside of this one says 'Dear sanjay' and the last image which is the inside of the one I personally received that is printed 'Dear Rik') and included the demo UMD and also a special God of War emblem that could be tied to the wrist strip holder of the PSP.
I'm not sure (yet) if the Demo itself is any different than the one that was later distributed to the general public...
(Last name and address blanked out...)
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