A team has finished a game with 12-3 runs on that many hits 2 times since 1897, most recently Newark Eagles on 21 May 1948. That is about one every 221,502 team-games.
Box score for the most recent one ↗
11-2 11-3 11-4 12-0 12-1 12-2 12-3 12-4 13-0 13-1 14-0 14-1 14-2