Me neither.
High-speed copy machines have a switch in the chassis near the platen. When the magnet in the cover is lowered to it, the switch engages one or more electrical sequences. Ask your xerox machine's repairman about magnetic switches.
Nineteen jetliners will fall from the sky at noon one day—and everyone will ask, "How'd they do that?" :-(
In a copier or printer a magnetic switch system is often used to indicate or signal the separation, mating, alignment or docking of components movable relative to one another, by the actuation or non-actuation of a magnetic switch on a first such component, such as a fixed frame member, by a magnet or a second such component, such as a manually movable tray, which magnet and magnetic switch are positioned such that as the components are moved together and docked the magnet actuates the magnetic switch. Copier or printer component position floating magnetic actuator
A simple magnet is a component of burglar alarm switches mounted to windows and doors in residential and commercial applications.
This incident does not have an innocent explanation.