Years ago I saw a photo of several pistols that had been wrapped in a Confederate coat and buried. They were refound in the early 1970s with a metal detector. All the wood had rotted, and the pistols were rusted junk.
Years ago I bought an 1873 Winchester rifle 44/40 that had chinked in the walls of a log cabin. it was rusted up but still worked. Wonder what story it could tell as to why it was chinked in between two logs in the log cabin. I still wish I had it.
Then there are all those rifles at the bottom of lakes lost by FReepers.
The lake-lost weapons were slathered in grease and in airtight containers, I hope!