Has an AFL game ever ended 123-54?
Exactly once. On September 5, 1999, Essendon beat Sydney 123-54, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 123-54 in league history.
That makes 123-54 the 3883rd most common final score out of 6,649 that have ever occurred in AFL. One point away, 124-54 has happened 1 times and 123-55 has happened 2 times.