NEVER assume there's no paper trail.
Just wait till something goes wrong and see how fast the owner comes up with the cancelled check that the contractor deposited into his business account. Not to mention anything the contractor wrote down on company letterhead. Put somebody in a hot enough seat and they come up with all kinds of interesting paperwork in order to save their own butt.
You failed to mention whether a full size grounding conductor was installed in the conduit in question.
