When an apparently previous owner claims he is the current owner, against the apparent current owner. What kind of proof would be necessary? All of which leads into a case and a story - to summarize the issues and the legal decision: an outstanding loan that is contested. Also, a new mishnah! The case of one who has paid a portion of his debt, what do you do with the IOU notes? How much scope for confusion - or fraud - and when do you need the courts?