Finding a clue

Pinkerton launched an investigation.  What happened to the bag of Party Mix that was left over when everyone ran out to sit on posts?  There were four bags.  Three were consumed by ten cats on Valentine's Day and one was left for dessert.  The Hillside Warrior has followed a

clue

and wound up inside the outside wall of a grain bin. 

Wait!!  Maybe Pinkerton stashed the treats up there in the wall and he's gobbling them up right now.  If that's the case, with a belly full of treats, he may be stuck for a while......right there in the wall!!