What is the youngest written record from Arda?
I’m not refering to the last thing that we know has happened, or what Tolkien had in mind (e.g., in Wikipedia’s Timeline of Arda, the last entry from the Fourth Age is "c. 220: End of Eldarion's reign", but this seems to come from one of Tolkien’s letters), but to something written by inhabitants of Arda.
According to the linked timeline, a copy of the Red Book of Westmarch was made in year 172 of the Fourth Age. Was there anything (even mundane things like, say, a report on poor harvests) later?