What does a native man find on Isla Desolacion in Chapter Two of the novel, The Ice Limit?

In Chapter Two, a native man paddles to Isla Desolacion and finds a partially dug hole. Beside the hole, the man finds equipment he does not recognize and the near naked body of a man. He takes items he thinks might be of value and leaves the body where he found it, deciding not to tell anyone about his find should they think he stole the items.