Isiah Thomas was furious when he saw his 1984 NBA All-Star Game MVP trophy hit the auction block recently -- claiming it's "stolen" property that was heisted from his old high school.

The trophy itself is a pretty cool item -- Thomas won the award after posting 21 points, 5 rebounds and 15 assists while playing against guys like Magic Johnson and Kareem Abdul-Jabbar.

Thomas says he allowed the trophy to be displayed at his old high school in Illinois, but claims it was stolen back in June 2019.