I am not sure which "Descendants of Moses Letts" your have. Is this something I sent you previously? Here is what I have: William H. Letts married Josephine Conklin. Hubert Letts says 1856. IGI Says 5-8-1856. My personal notes say possibly 1852. This is a date that will likely get researched and I can try for a document in the next batch that I request if it helps you. What date do you have or feel is accurate? Or is it the marriage date that is being questioned? I haven't put together a document list beyond NJ Archives (1878) but NJA did recommend 1879.
Let me know which date to research.