I would be cautious in ascribing the origin of these bone scabbards to whales. I've been through the other thread and although it is true that whales
generally have more spongiose bones (known as
cetacean osteosclerosis), compared to other mammal species, it does not translate directly over into a piece of worked material of comparatively diminutive size.
It's not that I don't think it's possible that whale bone was used as keris dress material, but rather that I question the possibility of differentiating it with the naked eye. Does anyone have a historical source for the use of whale bone across the archipelago? I would love to read it and be beyond grateful to anyone who could help.
All the best, - Thor