Has an Olympic Basketball (Men) game ever ended 83-81?
Exactly once. On July 20, 1996, Lithuania beat Croatia 83-81, and no Olympic Basketball (Men) game before or since has ended that way. When it happened it was a scorigami, the first 83-81 in league history.
That makes 83-81 the 126th most common final score out of 698 that have ever occurred in Olympic Basketball (Men). One point away, 84-81 has happened never and 83-82 has happened 3 times.