He's back.. He's been somewhere Away for at least 3 days, possibly sleeping under the old barn flooring, but I had figured him for dead by now. All the cold, the food in the dishes untouched out there. I left the kibble. Then yesterday, at -10 i went out to get wood and heard Charlie, meow meow meow meow squeak squeak. Sitting in the Tunnel, yelling his head off. 'where's my FOOD? I go away for a couple of days, come back, and the food is gone and I am HUNGRY" (typical male, right)
He went through 2 1/2 cans. I pulled the dishes far enough forward so we were about a foot apart, and he was just hungry enough and cold enough that he was willing to risk it, to eat.
Coulda grabbed him, but that is a lot of cat to deal with and I really didn't look forward to a bloodbath at that stage. I talked, he chewed.
This morning he was back, and it looks like his bed was slept in last night. Nothing i can do about the cold, but I can at least shelter him and feed him.