mdt002

Hi all, I've just pulled my mouse out of my bag and noticed that the T9 button (the one that decreases the sensitivity by default) has been busted and is now inside of the mouse (see attached photo). I think if I could open up the case, I could just pop the button back into place, but I don't have any idea how to open it. Even if the button will never work again, I'd still like it to be in the right place so I don't have a hole in the top of the mouse. Thanks for your help