Carl Denham: I'm someone you can trust, Ann. I'm a movie producer.
Carl Denham: It wasn't the planes...it was beauty killed the Beast.
Carl Denham: Bring the tripod and all of the film.
Herb: Want to switch to the six-inch lens?
Carl Denham: The wide-angle will be fine.
Bruce Baxter: I'm just an actor with a gun who's lost his motivation.
Carl Denham: There are thousands of actresses out of work in this city. Somewhere out there is a woman born to play this role... A woman who will journey into the heart of the unknown... Toward a fateful meeting that changes everything.
Jack Driscoll: Actors. They travel the world and all they see is a mirror.
Answer: They scared them off with their guns. In the scene where they capture Ann to sacrifice her to Kong, Denham and his men come to rescue her and when they start shooting the natives hide. It's never fully explained but the most likely answer is that they are too scared and have even moved villages or are just hiding really well.