No one in our foursome saw the ball go in the hole. The sun was behind the green making it hard to see. One player's ball was on the green about 6 feet away but I thought that was my shot. Another was in a bunker and the third was looking for his ball. When first player said it was his ball, I went to the back of the green and saw a ball just in the rough so had to go back to get my wedge. When I got to that ball player 3 and I noticed it was his ball. So I started looking for my ball over the green but didn’t see anything. Just per chance I looked in the hole and there it was! Not sure what prompted me to look there because player 2 had putted while we were looking, knocked it close and I thought he had tapped in. If my ball was in there he would have noticed but he just picked his up. So I took a look and there it was.