The complete package!
Robert, fess up and tell us what the 6th piece looks like!
Nice spear with original binding; looks like all items were stored in a dry attic for a long while - preservation seems above average.
While I usually balk at what sometimes passes for provenance ("from the Tirri collection" or somesuch crap), it is really great to obtain sound info from the original heirs, especially if this may help to pin down the (likely) origin of these pieces. If all these came from the same region, I guess this may be some coastal area on Mindanao (including the Zamboanga peninsula) - please keep us posted.
BTW, the shaft/pole is rattan (a climbing palm) with its natural nodes - no carving needed.
Regards,
Kai