When fleshing out a town for your D&D campaign, if a building is worth writing about it's also worth considering at least one reason why the characters might be tempted to break into the place.

— Mike Mearls (@mikemearls) October 26, 2018

A wizarding school? Plenty of reasons.

Magic stuff to steal
Someone wants you to find proof that they’re summoning demons in there.
Needing a sample of a high-wizard’s handwriting for forgery purposes.
Someone went missing. Are they being experimented on by depraved mages? The students steal a character's beloved trinket or magic item as part of a scavenger hunt.

— Mike Mearls (@mikemearls) October 26, 2018

Very nice!

— Mike Mearls (@mikemearls) October 26, 2018