I’ve got mice.
I’ve just been through my ‘big box of junk’ since it had gotten too heavy and was making my shelves fall over, lurking at the bottom of it were mice, six of them, in various incarnations from the oldstyle Microsoft inport busmouse all the way through to PS2.
So if anyone can think of anything to do with the kinds of electronics you get in mice I’d be interested to hear about it.