You see from your room out of you window a man talking to your mother. He's the new roommate who rented the rented room across from yours for a specific period

You got curious who this man is so you waited for the man to be alone in his room. When he's alone in his room he left the door open so you lean against the door frame and see the man who hasn't noticed you yet

"Where is my box with my books?"

he says to himself in his deep, irritated voice and looks for the box in front of him