Philo Vance - The Ivory Murder Case

Joe Hillary and Tom Duncan are on an ivory hunting expedition in Africa. At the end of a very successful day, they find themselves quite a distance from their base camp. Joe says "Tom. we might as well rest here for a little bit. No sense in trying to make it all the way back to camp tonight". Tom says "Yeah, whatever you say Joe. Funny thing about fate isn't it?" Joe asks "How do you mean?" Tom says "We woke up this morning a couple of guys without any money. We go to sleep tonight millionaires. That ivory we found, there's at least 2 million in it". Joe says "We had to get paid for coming all the way to Africa, didn't we?" Tom says "Not that well. If those natives would just stop with those tom-toms,  and their chanting. I wonder what they mean?" Joe says "I hope that they are saying everything is okay". Suddenly, their native African guide, Tonga, appears. Joe asks "Yes, what is it, Tonga?" He says "Natives tell me to ask you a question". Joe says "Go ahead". Tonga says "Natives ask to leave ivory here. It belong here". Joe says "Oh, they do?. You go back and tell them that the ivory belongs to whoever finds it, and we found it. And tell them to cut out those tom-toms". Tonga says "Please, Mr Hillary, Tom-toms mean what they tell me to ask you, to leave ivory here". Joe says "Tell them to cut it out". Tonga says "Tonga tell them, only Tonga not sure other natives listen to him". Tonga leaves, and Tom says "Well, that's that. Now, let's talk about you and me". Joe asks "What about us?" Tom says "Just in case there's any doubt in your mind, Joe, let's understand this. I don't trust you too much". Joe says "That's nice to know". Tom says "We've got the ivory. We'll bring it back and you'll sell it. What do you intend to do about paying me off?" Joe says "Oh, I've thought about that, Tom". He says "That's nice. You know what I'm entitled to, don't you?" Joe says "I certainly do, and I've just decided what you're going to get".