Green’s Dictionary of Slang

1. one who takes the booty away after a successful burglary.

1859		Hotten Dict. of Modern Sl. etc. 105: SWAGSMAN, one who carries the booty after a burglary.
1865		Leaves from Diary of Celebrated Burglar 99/1: Our ‘swagman’ I found at his post, and telling him where to go, I left him and watched the ‘copper’ for some distance.
1873		Sl. Dict.

2. one who receives stolen goods.

1890–1904		Farmer & Henley Sl. and Its Analogues.
1949		Monteleone Criminal Sl. (rev. edn) 230: swagman A receiver of stolen goods.
1950		Goldin et al. DAUL 215/2: Swagman. See Swagger.