Welcome to ECN!!
Let's talk about the 'box & outlet' a little.
Was there a WP cover and receptacle in the box?
As it's not really clear, was the wiring that fed this box within the EMT?
IF the answers to the above are "Yes", and the receptacle had correct polarity and GFI (if applicable), then it's very doubtful that a HI would have flagged it.
I'm assuming that the wiring you discovered was connected to the zip cord you have in another thread.
Edited by HotLine1 (12/16/12 08:52 PM)