I'm fairly sure this is a hardware issue.

One hardware interrupt is fired when Shift/Fn+NmLk is pressed for the
first time.

Subsequent presses do not result in further interrupts.

I am in the process of contacting Lenovo and will update when I know
more.

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ThinkPad T61: num lock key generates an input event when turning on, but not off
https://bugs.launchpad.net/bugs/281669
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