Accidental collector - old weapons ID assistance (Yao?)

[Jampot10]

Good Morning or maybe evening for some !

Now it looks like we're thinking the ivory handles are Hippo - I have to say looking at these in the flesh they are much whiter and smoother to touch than previous Ivory I've seen.

My next task is trying to pin down what the handle on the larger knife might be. The original pictures were poor and taken indoors under artificial light. These ones are outside, natural light only and hopefully much clearer. There seems to be a kind of yellow - orange colour alongside the darker features of the handle.

The white speck in one of the pictures is paint - shame but I did find these in an old tool box so can't complain.

Would anyone be willing to give an opinion on material ?