A little more on that box....
Blue boxes where common, both nail on and old work.
The counter guy at the local supply house (long out of business) said, 'check out these 'new' old work boxes, 20+ cubes, sturdy, nice wings, etc. 'Wow, they are grey!!
I just guess that the inspector thought the 'gray' was metal. He did not accept the phone call that it was plastic, seemed to be set on the fact, so to save time, and not have to sit around and wait for a re-inspect, I did what I did.
