Soorry, poor phrasing on my part. Lambrecht reported that he saw no signs of aircraft (implying that he was confident that he knew how to recognize downed aircraft), and saw "recent signs of habitation" (ambiguous implications). Were these observation skills due to training, or to natural ability? If due to training, it would be helpful to find some documentation of the training received. That would enable a calculation of the chance of spotting things on the island, etc.