I know of an MX3 in California that was last shot near the ocean. Not cleaned and stored in case under a bed for about 15 years and rusted up pretty good. Does that sound like it could be it? Where was the seller from?
Don’t believe it was same gun, think the one listed probably could have been salvaged, did not see any pitting just rust spots all over all the metal but pictures can be deceiving.
Nothing like having it in your hands to look over.
It may get listed again in pieces, time will tell.