Following up onmy own posting after researching for some time...
The line of Shobers whose family members asserted they were Swiss and descended from a Swiss Jacob Shober, were actually not Swiss, but German, from the Palatinate, and were actually descendants of original emigrants Johann Simon Shober and Maria Barbara Wüst.
The Susanna Elizabeth Shober Surbaugh spoken of by William B. Shober, was the daughter of Simon Shober and Charlotta Eberhardt of Loudoun, VA. My thanks to Dick Shover for all of his excellent information which hasbeen very helpful to me in getting a grasp on this Shober family.
Through Dick Shover I also found that Susanna Elizabeth Shober married JOHN SAURBAUGH/SURBAUGH, and have been able to locate this family on census records.
I have found the writer of the message to Florence Surbaugh, William B. Shober, listed as Willie B. Shober,age 15, son of James Madison Shober and wife Lucy, but have not yet located him on census records as an adult.