Indeed, right from the start…
"In 1998, a team of renovators working on restoring the former Franklin abode uncovered over 1,200 human bones in the basement of the house. The renovators and conservationists were stunned, and the bones were quickly analyzed. Scientists deduced that the bones did date from Franklin's day"
"Initial estimates are that the bones are about 200 years old and were buried at the time Franklin was living in the house, which was his home from 1757 to 1762, and from 1764 to 1775. Most of the bones show signs of having been dissected, sawn or cut."