This appears too easy to be true, so I took a shot at it, even though it is over 200 km from my home (no I did not go there myself).
First I asked SW if we are looking for a BALL or for a coin, but got no reply
Then I contacted several people who live there and know the area. I explained the game and the expected ball/coin location (2 possibilities), and one of them went for it.
In his words:
Hi, this morning i went to the hill to look for the ball...i didn't find him.
At the place the description sends me was a great chaos of cut down trees with no chance to search for the ball.
There was a lot of snow this morning.i didn