Actually Ron, if you ask me (i suppose i am an optimist

) i would say that the keris is in pretty good shape. Even if you can't restore the sheath, the blade looks great. Needs a good wash and a proper staining, but it has held up rather well, especially considering where it has been living over the years and it's lack of care.
As Lew points out, uwers (mendak) are fairly easy to come by and relatively cheap, even for a silver one.
I can't see if any of the actual wood is missing, but if not you can probably restore the sheath to some form of usefulness.
If you don't want to undertake such a project send it to me. I might not give it back to you afterwards, but i will give it a good home.