Gonna get rid of all the easily moveable furniture in my house except for one chair, and then leave my most valuable belongings in a vent in the furthest reaches of my house that you can only reach if you move that one single moveable furniture (the chair) up to it so you can stand on it to reach it. I will also congratulate whoever finds it with a post it note saying 'You found a secret!'
If he's not a gamer he may be deeply confused.