We had two cream outlets in our living room and my wife painted and wanted all white ones. They are the three pronged 15amp outlets. So I bought two and switched them out. The first outlet is controlled from a light switch so you can plug a lamp into it and shut it off and on with a switch. The second outlet is always on. Both outlets were wired exactly the same. One wire going to the left side and the other wire going to the right side. There is no ground wire on either of these outlets. When I tested the outlets with a tester that you plug into the outlet the outlet that is on the switch says there’s an open ground. Which I expect. The other outlet that is not on the switch says it’s wired correctly even though I know there is no ground wire going to the outlet. How is that possible? I do plan on correcting this if I can or have an electrician do it but I’m just curious how it’s possible and should I check the rest of my outlets in the house for this even though they all test out correctly? Just bought the house a few months ago.