Agree 100%.
The "Guys" part of the audio to me is a dead giveaway. It's not southern at all, more Northern Cities Vowel Shift/Inland North American. It sounds like "Guise", same way I would say it, and it sounds like a question, like he's getting their attention. "Guise?", (then some time later), "down the hill" (phone probably in a pocket by that point, voice muffled and garbled).
MOO is he lives somewhere in north central Indiana, but possibly further afield, maybe much further out. I still maintain he was home by supper, so in my mind he lives within a 2.3 hour drive of Delphi.
JMO