Why do you think Chris opted to include his real name and social on the second form?

This is interseting. On the second form, dated March 30, 1992, two weeks before he left for Alaska, he’d signed his given name: “Chris J. McCandless.” And in the blank for Social Security number he’d put down, “228-31-6704.” Westerberg phoned Alaska again. This time the troopers took him seriously. I'm thinking that Chris might have thought what he is about to do is serious: a little foreshadowing perhaps?