It was one of four bones found by a group of people over the summer.
The bones may have been in the shed for several years.
The crew unearthed the items and, believing them to be bones, called authorities.
Officials on Tuesday confirmed the remains found July 4 are those of Adam Johnson.
Adam Johnson's partial remains were discovered in June.
It is unknown at this point if these remains may be connected to the case of Adam Johnson.
Foul play is not suspected in his death.
The victim has been identified as a 36-year-old man.
The body parts were discovered around 9:20 a.m. Thursday.
Litter pickers found the remains just across the border in Wisconsin.
Blood was found at the campsite where the 29-year-old was staying.
The remains were found in a wooded area of Wisconsin in 2017.
The 36-year-old had been missing since his vehicle was found crashed in a ditch.
The human remains were found by a walker on April 1.
Foul play is not suspected.
The sheriff's office has not officially identified the human remains.
Few details about the case have been made available.