Has an Olympic Baseball game ever ended 8-5?
Exactly once. On August 24, 2004, Cuba beat Canada 8-5, and no Olympic Baseball game before or since has ended that way. When it happened it was a scorigami, the first 8-5 in league history.
That makes 8-5 the 48th most common final score out of 87 that have ever occurred in Olympic Baseball. One point away, 9-5 has happened never and 8-6 has happened never.