bone daggers and a couple questions

[Matt Splatt]

I've had these for a couple years and I thought I'd put them up and see what you guys thought. These are from a collection that was put together in the forties and fifties. They are both look like they are stone worked to me. Are they Sepik? Are they Upper Sepik? Are they Cassowary tibiotarsus or made from Human femurs? Are these "husband killing" daggers? Thanks in advance for your expertise.