Has an AFL game ever ended 173-56?
Exactly once. On June 17, 1944, Richmond beat Geelong 173-56, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 173-56 in league history.
That makes 173-56 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 174-56 has happened never and 173-57 has happened never.