Hi Tim,
i have a new information since i got in contact with the Grassi museum in Leipzig, Germany, about these items.
First i have to correct the orign of the lower spear.
It came from Bougainville / Baku, northern Salomon Islands.
(I should better read my texts
)
The lance above most probably comes from the northern PNG region, formerly Kaiser Wilhelm Land, near Potsdamhafen which is Awaro now.
best
Dirk