My friend wanted to trade shells or something.. because something about he couldn't play chao adventure, and so he wanted to trade vmus with me, but he wanted to keep the blue case. So he took it upon himself to switch the two, but ended up having trouble taking his apart and ripped the speaker wire... realizing, i think, that if he continued, and ripped the wire out of mine, he wouldn't be able to play chao adventure with the noise/music so he gave me his blue one, the one he hacked apart.
I didn't really pay attention to what he was doing, as i was busy playing the blades of steel he gave me, so i'm not sure if it's impossible to remove the case without actually butchering it, but i can tell you that he's not too mechanically inclined.