Oh wow, I can't believe I missed this thread and missed all the fun. Fantastic news that you have managed to catch him/her. Are you keeping it yourself or have you found a home for it?
As regards how far snakes range I really couldn't say. I'm not sure if any studies have been done. I'm off to investigate when I have finished on here. My corn Izzy escaped and was found 2 days later about a meter away from his viv the lazy git.