In August 1988, Mitchell bought at auction a calling card case made out of skin taken from the back of the left hand of the infamous bodysnatcher William Burke (of Burke and Hare fame). The calling card case for many years was loaned to the Police Information Centre in Edinburgh's Royal Mile. It is now displayed in The Cadies &amp; Witchery Tours shop (aka The William Burke Museum) in Edinburgh's West Bow. In 1997 the calling card case featured as part of the Wellcome Trust's exhibition Dr Death: Medicine at the End of Life. The calling card case featured on the BBC's Antiques Roadshow in May 2007 with Michael Aspel and on the Channel 4 show Four Rooms on Wednesday 25 April 2012.