His response is automatic and without thought. "Teme! I told you to stop calling me that!" He folds his arms across his chest and glares at his 'friend'.

After a moment he turns his gaze towards the building. "Where should we start?" It's not like the school was a big building, but there were a number of rooms Naruto could have dropped the letter. Basically anywhere from the bathroom to the principal's office. And that doesn't even cover the classrooms.