Sergeant Jeffords: I hid five clues, each leading to the next. And the last one gets you the tube. The first clue is under your chairs.
[later:]
Amy: "Our fallen colleague missing still..."
Captain Holt: "His replacement fits the bill..."
Jake: I can think of one colleague who literally fell. We all watched it happen and then we ate his sweet candy insides.
Charles: [shouts] The vending machine! [quietly] Is one theory, probably incorrect.
Jake: Damn it, Charles. Silent epiphany!