But I would have him walk through the process starting when he got out of his car and walked into the house. What side of the sidewalk did he walk on going into the house. What rooms did he visit? What chairs/sofas did he sit in?

Where does he normally keep his key fob? Is it one of those that stays on the keyring or on his key, or is it separate? Does his car have a "start button?" If so, where does he normally keep his key fob, in his pants pocket? Does he check to see if he has his keys/key fob when he locks his car? (After locking the keys in my car once, I always hold my keys before shutting the car door.)