Green,
Not only Arab traders but also Portuguese as can be seen in this link providing such ivories to the ruling family of Flores...note one image there of some very large hippo teeth.
I know in 1954, the island of Sumba was travelled to by Balinese who were commissioned by those in power to provide carved elephant tusks.
Flores may have been a large trading centre for such things but I am sure there is other references out there suggesting the same in Malaysia. I am sure the trade was far and wide throughout the entire island regions.
Gavin
http://www.vikingsword.com/vb/showpo...9&postcount=45