From Pioneer Ohio Newspapers; Genealogical and Historical Abstracts;
"A list of letters left at the Post Office in Hillsborough includes William Anderson, Richard Baldon, Margaret Baldon, Jesse Baxter, Elizabeth Blaze, John Burnett, Mrs. Brougher, David Bahlon, George Brown, George BONECUTTER, Arthur Black, Philip Bartley, John Contryman, Hiram Conell, Robert Constable, Robert Carson, William Cavinger, Urlinda Cating, John Campbell, John Carry, Charles N. Clifton, Isaac Cliance, James Collins, James Correthers, Lewis Duckwall, .............

Do you have access to those letters or is there somewhere on the internet you can look at them or find something about them and their contents?

No, the book I got this info from only lists the article as it appeared in the newspaper. The only info you can get from this is that George Bonecutter was in southern Ohio in 1816 (or, that some one believed him to be there and that is why they sent him a letter to that Post Office).