Keeping people out of the well is simple. It is barely big enough for a bucket let alone a person.
There is a wooden tub with water at the bottom that the coins fall into for the 'slash' and they would be very easy to get out. Also since he gets to the wooden tub through a tunnel from his basement no one will see him do it. Go to Comment
This piece is not meant to be a literary masterpiece. I take this as it was meant to be, only seed for thought. I happen to like several of these ideas and I also like the way the are presented. A sentence or two and my mind can take over from there.