They (mouse makers) often hide further screws under the feet of the mouse, that or it hooks on to the front or back and uses the screw to hold the other end in place. Though once the feet are off its very difficult to get them to stay back on.
Of course if it is still under guarantee then just take it back, otherwise the sticker don't matter no more.
I have to say though, I don't know how you managed to clog the wheel with dirt, I have owned and destroyed a lot of mice, but never have had that problem. I would suggest that you try cleaning your hands before using the computer.
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