[Richard]

I don’t know everything you have tried, so pardon if this is already evaluated path.

I would pull the room in, and open all the access panels in the area beneath the bed. My thinking is the switch may be hidden from view with the room out. Some of us have little endoscopic cameras that could be used to snake around and look into hidden spaces.

And one last idea, I see red and black wires for the switch in your picture. If you follow the green and black wire pair, where does that go?