I am almost jealous of you!
Very nice laraw yuanzhumin! It seems with most Atayal (Dayan?), Seediq, and Truku blades, the sheath is the most artistic part of it, with the higher status individuals having nicer sheaths -- since the blades all seem relatively similar (some straighter, some more curved, some a little rough finish, some finer, some wooden handle, some metal socket, etc.)... the sheaths are very graceful looking, like a fish, no?
Saisyat blades (malat?) seem to be stylistically very similar to, but distinct from Atayal/Seediq/Truku knives... I wonder why they preferred straighter pointed blades and sheaths without wide flares at the end.
but maybe I haven't seen enough blades to make a good judgement... ?