Has an AFL game ever ended 123-57?
Exactly once. On May 13, 1950, Fitzroy beat Sydney 123-57, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 123-57 in league history.
That makes 123-57 the 3883rd most common final score out of 6,649 that have ever occurred in AFL. One point away, 124-57 has happened never and 123-58 has happened 3 times.