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You can use a small magnet and move it on the cover to see is there at magnet at all. I've seen ones with no magnet.
The "proprietary technology" is the crayon department technobabble. A hall effect sensor is cheap and small and operated by a magnet. Named after Hall who discovered it in 1879!
Used in keyboards from 1960s and game controllers from 1990s.
Used to sense wheels for "anti-lock", electric scooter throttles maybe 20 years ago. Timing sensor for car ignition.
There is no Kobo proprietary technology involved. It's a commodity part made by dozens of companies.
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