I can't really speak for the ESA.

I suspect that if the inspector wanted to get all involved, he could look at the wires, check out the date stamp. He might ask you who installed these wires. I don't know.

Or he could just do the job he was asked to do, which was inspect your panel and go.

I'm just not sure how you phrase this with ESA. Do you call them up and say, "I have an existing panel in my house and would like to have it inspected"

To which they respond, "why wasn't it inspected when it was installed?"

To which you respond....I dunno what.

You could tell them the truth (The truth will set you free.)

You could lie and say it was there when you moved in and you want to make sure it's ok.

As far as inspecting the wiring goes, if the walls are closed and you don't have photos of the wiring when it was built, the ESA really can't do their job.

Allot of people have a basement built by a neighbourhood contractor who will wire it without permits. That's not that unusual. Some guys know what they are doing and others are hacks.