I would like to add that
UP72758 was also found in the Red Rock Canyon later in the same month (June 24). Also partial skeletal remains, also sex/age/race unknown. Probably from the same person?
Also if anyone is missing the link for 72757:
72757
Additionally:
87817 was also found in the Red Rock Canyon in January 2021. Partial remains, also s/a/r unknown, described in the description as one bone, found during a search for additional bones from a previous case.
I wonder if all 3 were the same person?