The box is grounded and when the plug is screwed to the box the plug is grounded to the box, Not as good as a pigtail but that is why you're read that a ground is there.
I still can't find what breaker that shuts the outlets off. Can I short to wires to trip the breaker so I have to keep running to and from the basement?
Plug in a radio real load and go the basement. Run an extention cord with a light.