You are most probably wright, David.
The edges on greneng and kembang kacang are not really worn; this keris never needed resharpening, becouse it's probably very near to the original condition. What was my point, is the possibility of a visible file work on a non-Madura piece.
I ask me, if the sheath of the "initial" keris, if it's something older, would be not to small for any sundang at the mouth (maybe not for a sundang patrem
), the keris in it should be not to large (32,3 cm length from Ebay description).
Of course the sheath could be reshaped at the mouth and shortened (it would be the answer for the possibly new buntut), and this must leave signs. Are they visible on this sheath?
I suppose, it would be less complicated to make a new sheath then recarve a sundang sheath to this size.