The three Life Emperors didn't even want to question Kent at the moment.
The puzzle they had received—and which they themselves had spent three weeks trying to solve but couldn't—before putting it out to the entire world, was just solved by a junior.
If there was no reason to give Kent face, then this feat alone was enough to earn their respect and prevent them from questioning anything he says.
Thus, they allowed him to move toward the boxes.
Kent, meanwhile, held a puzzled look in his eyes as he walked toward the three boxes.
'So this was what the quest was referring to as the puzzles. The riddle was just the appetizer for the main dish.'
⟦All the master has to do is place his hand on the various boxes, and the puzzle to solve would be revealed. It will appear as if you're learning a new skill or technique.⟧