There have been literally hundreds of people who have come and gone in the... eight years at the end of the month, that I've been with this world. Some of the 'beings' I didn't know what they were, but if I could feel the magic off them I'm sure someone with actual magic experience won't have a hard time finding them.
Um... There's also stuff that was Gen's Dad's. Those boxes are clearly marked. His name was Sirius Black. And other people from that world.