At the library today, I found a few additional facts on Benjamin F. Roberts.
The Huron County death records (1867 - 1908) list the following information:
Benjamin F. Roberts -- Died May 8,1889 Sarah J. Roberts -- Died March 24, 1879
The information is extracted from the Office of Probate Court in Norwalk, Ohio. Benjamin is recorded in Volume 1 page 156, and Sarah is recorded in Volume 1 page 67 and page 72. Why she is recorded twice I don't know.
B.F. Roberts also has three brief mentions in the following:
History of the Fire Lands Comprising Huron and Erie Counties, Ohio Published in 1879
1st mention -- Page 65, under heading "TEMPERANCE" The Huron Temperance league was foundedJune 7,1850 " The following gentlemen were enrolled as county lecturers, and made addresses in all parts of the county during the year 1851 and the first quarter of 1852". Listed as one of the men was B.F. Roberts.
2nd mention -- Pages 156 & 157, under heading 'WHITTLESEY ACADEMY" "On the 30th day of May, 1853, a number of gentlemen being desirous of founding an academy, in said town (Norwalk), for the advancement of useful knowledge by courses of lectures upon the sciences and arts, and a library and cabinet of curiosities" made petition to the county recorder, to be incorporated under the laws of Ohio. A building for the academy was susequently built, and a library was also part of the academy. The history further says: "The academy is limited to twenty five members, who hold their membership during life, or until removal from the county". B.F. Roberts is listed as having been a member of the academy in the past, but was not a member in 1979.
3rd mention -- Page 360, under heading "FAIRFIELD TWP." North Fairfield Village "The following is a list of the business homes in North Fairfield in 1879". One of the business establishments listed was: Tin and Hardware - B.F. Roberts
Of the three mentions, the last is almost surely your ancestor, however, the first two may refer to the Ben.F. Roberts, who was living in Norwalk at the time of the 1850 census. He showed up in the 1850 Ohio census index info that I mailed you previously. Strange that there were apparently two Benjamin F. Roberts living in the county in 1850. Relative maybe? An additional clue that the Norwalk Roberts is the person related to the academy, is the fact that the info indicates that it was a life membership. Your Benjamin was still alive in 1879, but the history indicates that B.F. Roberts was a former member. The Roberts from Norwalk is not listed in any census index after 1850.
Well, I hope this provides some useful information. It probably also raises some questions.