I don't have an answer, but I have my own bone question.
My hiking partner & I saw a large femur in the upper part of Sixty Lakes Basin (2 thumbs up) at the lake just below the pass to Gardiner Basin (lake 59 or so). My 5'9" friend held it up next to his thigh, and it was almost as long as his upper leg, but I (who knows nothing) thought it was too heavy, too thick, to be human. We didn't see any other bones, and the one we saw was thoroughly bleached by sun & weather.
I don't know how to tell from the structure whether a femur is from a biped or a quadruped though I suspect it's possible to tell. I've butchered a few deer & know it was too big for that.
What kind of femur could we have found at over 11,000'? Bear? Mule? Human with big bones? Where was the rest of the critter? Did it die up there and the rest of the body was washed away? Or did someone/something carry the bone up there and leave it?
By the way, Sixty Lakes Basin is absolutely fabulous (but very buggy right now). Some of the lower lakes are shallow and sun-warmed for a swim. A research group is trapping trout out of some lakes to help the frogs make a comeback, and apparently it's working. The pass to Gardiner Basin was filled with large granite slabs and ledge systems that were a blast to climb but not difficult. I loved that upper basin area. It's talus on the west side of the pass. We spent two nights so we could explore and would have happily stayed longer.
