I have found both sheathing and nails at known wreck sites. One ship carried merchandise, the other carried people. Many lives were lost. The sheathing and nails I find in the bay are from caps for old pilings and the nails are different. What I find on the ocean floor are completely different. The pile in your picture is no doubt wreck nails. University of Delaware maintains a site that I have used to authenticate some of my finds. You have one hell of a collection and you worked your butt off for each and every one of them.