I am curious as well..if only to make sure I take extra precautions. Already I am telling myself GO LEFT, GO LEFT at the granite slabs when Mirror Lake comes into view!!! People keep telling me the trail is like a freeway, just follow the trail. You can't go wrong. Well, that is evidently not completely correct.
There are some spots above Mirror Lake where you might stop, pause and go OH there's the trail and move back onto it. With all respects, I also would be curious to see where he was found. It is somewhat haunting me that I hiked into and slept at outpost camp that Saturday night, and that after taking a day to summit, I spent that Monday morning fishing Mirror Lake.