So after four days of actively avoiding the yellow tv room, ignoring it, except for my daily site check to make sure my barricade is in tack and fully mouseproof, I saw him again. I had just warmed up my morning coffee, wandered over inspect my structure, when I saw him. I choked on my sip and just about sent my steaming cup of brew flying across the room. He seemed darker this time, sitting on the rug by the door. My shuffling and sputtering must of scared him, and he took off to some corner, out of sight.
The good news: he's still in the family room.
The bad news: I'm pretty sure he's made his home in the couch.