Has an AFL game ever ended 82-31?
Exactly once. On July 18, 1931, Sydney beat Melbourne 82-31, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 82-31 in league history.
That makes 82-31 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 83-31 has happened 1 times and 82-32 has happened 1 times.