"We started pottering around and found the chemicals and right next to them was a cardboard box. We opened it and saw the bones, so we closed it again and brought the chemicals over here and did what we had to do.
"Then we got talking about it and thought, 'Well, is it human or is it animal?' Eventually we contacted the local doctor, Dr Nathan, and asked him if he had some time to drop down and tell us."
It was an unexpected find because there was no record of a skeleton or bones being donated to the museum, Mr Tuck said.
"One of us opened it up and said, 'Shit, okay, it's a bone' and closed it again. We weren't expecting to turn that up."
He believed it was likely the skeleton had been used for teaching nurses at the hospital, as several bones were tied together with twine and two larger bones had illegible writing on them.
Most of the skull was missing, although the mandible and cap of the skull were present.
A medical intern confirmed the bones were human and Dr Nathan believed they were likely the bones of a young Caucasian boy, Mr Tuck said.
The police were contacted and the remains taken to Wairarapa Hospital for further analysis and DNA testing.
Mr Tuck said volunteers were working to catalogue the museum collection and had almost completed an inventory of items in the schoolhouse.