I'm sure he has signed something that said 'if we mess you're board up, too bad' and he's not entitled to anything, from a legal standpoint. I'd hold off calling the police.
Let's be honest, the board isn't worth anything these days, perhaps a refund of the tuning cost could go toward you treating yourself to a new board.
Naming and shaming can go terribly wrong unless you have hard evidence they did it. Otherwise, you could end up in legal trouble yourself.
Tread lightly and consider it a lesson learnt.