Game winning HR.....or not

[refman]

Federation rules...
Yesterday at a high school regional tournament, the championship game went 10 innings. The visiting team scored three runs in the top of the 10th. The home team loads the bases with two outs and with two strikes on the #9 hitter, he hits a ball over the right field fence. Absolute pandimonium breaks out....the runner on 3rd in his excitement misses the plate by two feet. The runner on 2nd touches the plate, the runner on first misses the plate by a foot or so. And to further complicate matters the histeric 3rd base coach runs up ahead of the batter and "slides" across the plate in a bit of a premature celebration.
The coach of the defensive team dashes up to the plate umpire to appeal the missed base and the umpire saye "coach....the ball was over the fence....dead ball...therefore there can be no appeal. I'm outta here".
When the losing coach called me today to explain the scenerio and vent his frustrations, I told him that according to his version of the whole thing, I think he got a raw deal. But, without actually being there, I hesitated to say much until I hear a couple more descriptions of the last inning.
Bottom line....can anyone point out the FED rule that would cover this situation?