The Gentry County Sheriff's office said a worker cleaning the building near the square on August 8 found the remains that had been "surgically amputated several years ago."
A county coroner sent the remains to a pathologist in Kansas City for further review. Authorities determined through their investigation there is no evidence of foul play.
Sheriff Tim Davis said the building had been used for various things over the years, but he would not go into detail.
He said he could not discuss how investigators came to the conclusion that there was no foul play, only saying additional information would be released later this week.