Okay, first off, if you have never opened up an M-Network cart before, PRACTICE FIRST. I made the mistake of just diving in and managed to make a small crack below the tab, creating a nice tampered-with look. Then I went to work on an Armor Attack, figured out how easy it really was, and finished the job. Then had some fun... (Back to that later.)
First off, take a guess which one was inside the Mission X:
Figured it out???

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Yep, it really is that boring. I don't see how this could possibly be any kind of prototype. Probably just a dead board that was used as filler.
But now that I figured out how easy it is to open these things up, I made a little something for myself:
Kind of cool.....