They haven't.
But if I had an old rusty keris that I wanted to sell, I'd clean it and stain it before I offered it for sale.
Everybody in the whole world who understands the beginning of anything about keris will do the same.
It is the correct thing to do with a keris:- you clean them and stain them.
So maybe the maintenance has been done regularly over a period of years, maybe it has only been done once , just before it was offered for sale, but whenever it has been done, it will result in a keris appearing with no rust on the blade.
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