Ex’s belongings

I go to college and my ex’s dorms are next to the computer lab I study in. Yesterday I found his water bottle and forgot to turn it in to the front desk. Even though its something small, I want it to get back to him. Is it crazy to wait outside his dorm and just tell someone in the hallway to put it in his room? By the way everyone in the hallway knows each other and especially him so I wouldnt be giving it to a completely random person.