The plate on the wall could have been a nice way to cover the hole- seems like a bit of an ace in the hole idea if you ask me - IF properly implemented...
Suppose there is no box behind it, that means that there probably romex running inside the conduit. And there is a high probability that it is not UF.
I would have prefered to see a strap on the bend.
If they did use UF inside the conduit, and if they did not use a box behind that lovely round cover, the conduit is bonded at the top through the RAB box.
What was your reasoning for the violation sparky?