Glad to hear you got the snake out safely and didn't have to involve the authorities to do it. Happy endings are always good.

Not sure how your house is laid out, but I've actually used a large closet (with lighting as needed) for quarantining reptiles before when I didn't have the extra rooms. It would also be nice, quiet, and dark for him/her to relax. Would also love to see pics as you get him/her fed up.