We moved into this house last year, and have always wondered what a
wall switch by our MBR closet is for. There are two switches; one
turns the closet light on and off, and we don't know what the other one
does.

I've tried all the nearby outlets, and it's not for any of those.

I've been up in the attic to see if I could follow it, but there's a
lot of insulation and I don't really want to disturb it.

I did take the plate off, and yes, there are wires to and from the
switch.

Is there any way to track down what the switch might control?

Thanks in advance !