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For such a dirty job, I do enjoy changing waste toner boxes. You always get this lovely splash of colour when they're full.
If you're curious about how this one works (and why wouldn't you be? ;)) then underneath the magenta port you might spot a clear plastic chamber.
That has an optical sensor at the side, and when the box fills up the waste toner slides into the plastic chamber and trips the optical sensor, and then you get a message on the coper to change it.