Why didn't Toyota include a lock for the glovebox and center armrest? Granted a thief can get into anything they want but most vehicles have locks in these compartments, why not the Prius?

I don't have one on my 06 Accord Hybrid and the (ex-) 03 Civic Hybrid was also missing one. They might be going the way of the cigarette lighter and ash tray

Maybe so but locking compartments is more a security issue for customers. I'd feel more secure knowing I left something in my car that was locked and inside another compartment that was also locked.