Earlier quoted context omitted.
I believe the guy has stated recently that it remains unfound.
He also claims to be the only person to know the location, therefore for him to verify that, he would have had to visit it himself. He's now 86 and probably not able to hike into the mountains to check. So perhaps it's not far from a road?
This is explicitly declared in the fine article. It's one of the clues referred to in the title.