Hate to say this, but I happen to know where you could find some
the guy who started Navy Arms, worked for a surplus dealer (I think Bannerman)
who owned an island on a major costal river in Maryland or Virgina (eastern seaboard between or around DC or NYNY)
and used said island, and the associated 'castle' for storage

LOTS and LOTS of Brown Besses, 1866's etc AND the bayonets were sunk in the mud to firm the boatlanding, used as rebar for a Pier etc.
Remember finding an account (once again, think Navy Arms founder) about him talking about his 'summer job' which happened to be working for the guy, or estate, demilling old Hotchkiss rounds etc. and all the 'misc' stuff he saw mouldering away there, and the job (his start) of cleaning/clearing the island for sale by the owners estate, and the stories of all the exploding cannon balls from the Civil War that were dumped from one end, and the various places where stuff like excess X was basically thrown away or used in such a way as to make the collector now squirm. REALLY wish I could find the article again.