The Missing Partner, or the Swagman is a 1904 Australian play by Edward Irham Cole.
[6] The Sydney Morning Herald said "The piece is interesting and exciting, with a strong vein of humour running through it.
"[8] "The overseer of the Carleton homestead is a picturesque figure, called among the station hands "The Unknown."
Graham robs Mrs. Carleton of some jewels, and circumstances point to 'The Unknown" as the culprit.
Graham "bails up" a coach, disguised as "The Unknown" who is blamed for it until the mystery is cleared up by "Old Mat," a swagman, who wanders through the early portion of the drama in a demented state, but finally recovers his reason and solves the problem of "The Unknown".