I've my doubts about this web a long time ago... but let's discuss.
It is not the property of the palace. It's is claimed(?) to be property of someone linked to the royal family.
The items are said to be very old, but... alas, I doubt otherwise...
Let start with the one mentioned...
Quote:
Keris Indera Pawa Janggi
One of the oldest Keris, believed to be 5,000 years old and category in 'Keris Picit'. It has Sanskrit words engraved on it.
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First of all, this piece does not show features of a keris picit, as far as I can see, (from the poor quality picture), 5,000 years old(?)... amazing. 
The rest, I leave others to comment.