Known or Virtually Certain - Revisited
Hole #15 - Mississippi GC - Blind tee shot - Lateral Water Hazard (swamp) all along the right side which cannot be seen from the tee. Trees on the right about 100 yards from the tee.
Situation: A player hits his tee shot towards the trees on the right in the direction of where the hazard is, even though the hazard cannot be seen. He and his FC's search for the ball both in the hazard and in the nearby rough, cannot find it and then mutually agree that the ball must be in the hazard.
Player drops ball withing two club lengths of where they felt the ball crossed the margin and plays the stroke to the green.
After playing the shot the player walks forward and finds his original ball in the rough.
A ruling is called for. How would you rule?