One thing Duane did do was call the WP reporter (Blumenfeld) and at first she denied writing the story. Then Duane realized he'd specified the wrong date and called back and left a message which I don't believe she's since responded to (so she's feeling quite gullible it would seem)
what's not on Kerry's website is the spots reports for December 1968. Though there are for Jan and Feb 1969.
That would confirm or deny his Cambodia story. Shouldn't it be released?