There could also be a possibility he acquired the pieces he liked from other soldiers, the krisses are showing taste. It seems to me, it is questionable he got the whole lot in one battle. I think many soldiers were more or less latent collectors.
I copied my speculative and suggestive post from the other thread, just to hold the information together for later:
Here some information from "Indonesian ornamental design" by van der Hoop, 1949, which still is a reference work for this region, and at least the kris hilt is coming from the neighborhood: the whole shape of this panel he calls a "mirror panel", and it is a chinese motif according to him, mostly found with other, like rock and cloud border, in Cirebon. Of course Ming ceramic is full of this kind of panels.
Of course this motif seems to be of Cetral-Asian origin; China absorbed much from the cultures of this region, particularly in the period of Yuan dynasty, many people in the administration at this time were muslims. Later many of chinese seamen, which participated in the great expeditions were muslims, most famous beeing Zheng He. Indonesian scholar Slamet Muljana writes: "Zheng He built Chinese Muslim communities first in Palembang, then in San Fa (West Kalimantan), subsequently he founded similar communities along the shores of Java, the Malay Peninsula and the Philippines. They preached Islam according to the Hanafi school of thought and in Chinese language."
It probably would be a long shot (as Gavin says), yet the origin of the motiv IN the panel could most probably be derived from the tree of life, at least regarding kris hilt.
(The other thread in question:
http://www.vikingsword.com/vb/showthread.php?t=13789)