Well...they're not Apache.
Just kidding! Couldn't resist the old western movies where the rugged cowboy rides up to the arrow bristled cover wagons and felled settlers and picks up an arrow and sternly proclaims with conviction....yup...Comanches ...as if the arrow has a label on it.
Always thought that was so amazing, as this seemed standard in these movies, with of course the tribal names varying as Hollywood 'research' strained the bounds of historic reality.
While I know little on these weapons, my guess would be that these are crossbow bolts, and naturally more will be discovered once researched.
What has your research revealed Colin? It seems leather would be an unusually heavy material for the 'flights' (?).
Hope somebody comes in on this.
All the best,
Jim