Has an AFL game ever ended 73-23?
Exactly once. On August 19, 1905, Carlton beat St Kilda 73-23, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 73-23 in league history.
That makes 73-23 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 74-23 has happened never and 73-24 has happened never.