Has a FIBA World Cup game ever ended 128-38?
Exactly once. On July 5, 1986, Canada beat Malaysia 128-38, and no FIBA World Cup game before or since has ended that way. When it happened it was a scorigami, the first 128-38 in league history.
That makes 128-38 the 240th most common final score out of 863 that have ever occurred in FIBA World Cup. One point away, 129-38 has happened never and 128-39 has happened never.