My brother and I saw what we think was a wolverine just south of Cle Elum last year, about the first week of October. First we thought it was a small bear, but then realized it definitely wasn't a bear. It let us walk right up within about 60 yards, we were walking on an old overgrown road and it ran off into the brush, not in too big a hurry. So we continued on down the road just a ways till it ended, and on the way back I took a couple steps off into the brush about where the animal had gone, and there it was, about 30 yards away this time. It was like nothing I'd ever seen, and after looking in some books we decided it had to be a wolverine. Weird because we weren't very high in elevation at all, just barely above the valley floor.