Correction - I saw the recovered engines over Memorial Day Weekend. The identification of the engines came up during the tour, and guide indicated conservation may take a couple years, but identifying the Apollo(s) they were used on could take longer. The engines were to last only 5 minutes. After a successful mission there was no reason to keep inspection paperwork which would carry serial numbers of the engines and sub assemblies. Most Saturn V rockets were launched on similar trajectories, the first stage was discarded at around 60 miles altitude and 8000 MPH, and would have broken-up from aerodynamic forces and heating before impacting the same keep-out-restricted-area of the ocean at 400 MPH. Furthermore, many dataplates would have been made out of stainless steel, with the engines made out of space-age Monel alloys. The Monel alloys with their high nickel content in a salt-water environment results in the stainless becoming the electrochemical sacrificial anode. They are finding a few identification numbers stamped directly in some parts but tracing those numbers to a engine number, and then to a particular mission is still an issue.