Obviously, something other than water needs to be used to stop the corrosive nature that seems apparent.

Those cases look worse than if they'd been fired with mucuric primers - rotten full length, probably.

I found a similar case that escaped the round file, a .45 3-1/4" that had been fired with Pyrodex - looks very similar in the neck area where it's thinner, but has weak spots along it's length, as well.

Thanks for the pictures, DD.