Some of the Lapeer County, Michigan, Probate files are online, at FamilySearch.org, but the files start at #446, so #23 isn't one of them.
Is Sylvester Richmond a descendant of John Richmond, the original immigrant, whose lives are chronicled at my Richmond & Connected Lineages blog? I don't know.
Administrator of Estate of Sylvester Richmond, part to James Kipp, Lewis Van Cleve
An Inventory of the effects of Sylvester Richmond, deceased
Given the 7th day of Jany 1843
#1 Note 6 Feb 1841 running to the bearer for $20 on demand John Porrit, amount $22.58
#2 Note 22 June 1840 running to Sylvester Richmond for $83.95....
#3 " 23 June 1840.to Sylvester Richmond for $12 John Porritt $14.13
A. H. Bancroft, amount $4.10
….appraisers James Vantine, John Vantine, C. Parshall
On May 26, 1896, a tornado passed through the area and killed a John Porritt, age 75, and two of his daughters-in-law. He may have been the John Porritt named in this probate file.