If I am not wrong, one keris only has been cleaned, and in my humble opinion the item does not seem so old, considering the very bad conditions of the other two. If, as Alan suggests, some sulphur was present on its surface, the conditions of this keris should be the worst. (sulphur is very corrosive on iron)
It would be interesting to clean the other two kerises, even if little iron is left, but we will never know for sure if the three kerises have been buried at the same time, even if they have been found in the same location, one close to the others.
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