If you find a thing which has been lost and keep it, you are committing a crime if you believe that the original owner had not deliberately thrown it away; and that the owner could be found if search were made. A purse containing money and an address could, obviously be traced; so could a cheque; an umbrella left in a train might be traceable; a valuable ring lost in the street would undoubtedly be reported to the police. But a shilling picked up in the gutter could not be claimed. Each case, therefore, depends on its merits.