What is the time frame?
I was down there with a bunch of Oregon Golfers for my Bachelor party in March of 2008 and I found a disc on hole 14, I called the number and get a girlfriend or wife of the player who it belonged to. She was local and said he would want the disc back but was not in the area. I told her I would leave it under the stairs at Yurt #1 for him to retrieve since I live in Portland. I hang up the call feeling OK about it getting back to him. There is no way you could see the disc unless you knew it was there.
So it sounds like either he never went to retrieve, she found it before he did or it was a different disc belonging to a different person I was describing