My phone has had some wear and tear, the back key felt stuck a little bit. So I took it apart to clean and two plastic parts (above and below the joystick I think) fell out. They look like a cuff-link...
I put it back together without them and it works fine but I'd like to put the pieces back. pic here- http://farm4.static.flickr.com/3490/3178256264_a335fa8711_b.jpg.