Scott,
This house is wired in the old style Romex.. (built 1957) From what I could see, there were all kinds of splices going on behind that box... From what I could gather, this was originally just a single switched duplex here before... someone came & added the 4S box, another device with the 2G P-ring... there is an outlet on the other side of here, which I opended, but that piece of extension cord isn't feeding from there like most of the amateurs would've done... (Unless there's an open splice on those lines in the wall also!)
I'm going to make sure I get pics when we go back for the full repairs on this.
-Randy