Birthdays and Missing Hairbrushes

Immediately after the Battle of Hogwarts, the School and its students have decided to celebrate Harry Potter and Neville Longbottom's Birthday together at the Great Hall. Though the school is under repairs, the students and the faculty members are also expecting the return of the Spy who lived on the same day. What would Severus Snape say or worse do if he finds out there is a part