I was in the area a few weeks after this crash for our hike up Whitney last year. At Horseshoe Meadows campground there was a very cryptic notice pinned on the information boards. It warned not to go close to the wreckage because it could be "dangerous to humans". And that if any wreckage was found it should be left in place and we needed to call a special number immediately. It also explained that the craft was not "piloted by humans", which we found odd. If it was a drone, say that. Not piloted "by humans" seemed to suggest something else was piloting the craft.
It was all very mysteriously worded. I was pretty sure it was an alien craft after reading the notice. I'm still thinking it might have been.