Hello Jose,
Water buffalo (kerbau, carabao, etc.) seems to be the quite universal default origin of Aceh/Sumatran hilts if made from horn; sometimes you see the blonde variety from albino mutant kerbau. I can't remember any antique piece for which any other origin of the horn was likely (much less verified which would be tough short of DNA evidence). Except for rhino that is, which has been utilized for carving very few smaller hilts (keris, etc.).
Regards,
Kai
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