Sylvester Day, surgeon, 5th Regiment, wrote the letter (seen below) on January 26, 1816. The original letter is archived at the NARA in Letters Received By The Office Of The Adjutant General, 1805-1821:
"The first of these documents, I once received, but it was lost with my baggage, in the Brig Adams, Oct. 1812." Note: General Hull's baggage was also lost on the Brig Adams.
Day was also listed on John Stewart's probate, as admin.