The King County medical examiner's office says the mysterious donation of three skulls at a Bellevue Goodwill bin has prompted three other people to turn over human bones.
The county's forensic anthropologist, Kathy Taylor, says one set of bones is bleached and wired together for clinical or educational purposes. The other two are Native American bones. They are not considered part of a criminal case.
The Seattle Times reports the office and a state agency try to locate family members. Otherwise clinical bones may be offered to universities. Remains of Native Americans must be returned to their tribes.
Meanwhile, the donor of the three Goodwill skulls dropped off last month has not been found. Two are clinical skulls and the third is the skull of a Native America child.