However, the original fort at Jamestown (where the coffin was found) was abandoned after a fairly short period of time and the English moved to Williamsburg. This would mean that only a small number of Englishmen would have been buried there.
http://www.apva.org/history/
The capital wasn't moved to Williamsburg until almost the end of the 17th century. (Williamsburg is obviously named for King William III, who became king in 1689.) Jamestown was still the capital at the time of Bacon's Rebellion in 1676. Quite a few men might have been buried at Jamestown in about 90 years.