Actually the pizza box is the part I'm the most likely to do anything with.
I'm never wearing the shirt or boxers because I feel like they're collector's items I should never touch. I did check out the art book, and it was interesting reading the creative process to the game's art, but now I'm done with it forever probably. The pizza box I can at least display on some shelf of nerdy memorabilia if I ever get a collection going.
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Ace Detective in Sir Chris' Police
http://img52.imageshack.us/img52/1804/valdez.jpg