Generally, an extremely safe campus. You’ll find kids leaving books/laptops and purses in a library carrell while they go to the bathroom or to the cafe. Stuff seems to be there when they get back. (Not recommended, btw, but quite common.)
Anytime, once you have passed thru orientation and have you Agora login.
Protip: Frosh classes can move during orientation when the next group is registering. (BC holds spots in typical Frosh classes so every orientation has a shot at decent times. But since you have the Agora login, you can pickup a different section if you time it right!)