Upon his death, his assistant, Frederick Koher traveled to Britain to avoid the ravages of the Nazi Party.
Whilst in England, he was operated on by Emlyn Lewis, who successfully corrected his Dupuytren's Contracture. In gratitude, he presented him with Joseph's instruments. These were in turn passed down to Lewis' family. In 1993, former BAPRAS archivist, Antony Wallace, was informed of this story and negotiated the acquisition of the instruments, which now form part of the archives collection.