Met one of his daughters (Deborah Robertson Bardsley) years ago at a Senate Select Committee on POW-MIA Affairs, she was very active in the POW/MIA community back in the early 1990s. Unfortunately, she passed away a few years later from influenza-pneumonia never knowing what happened to her father.
You may also remember back in 1990 this photo appeared in the press with the claims it was Robertson (left) with Air Force Major Albro Lundy, Jr. (center) and Navy Lieutenant Larry Stevens (right)...
Turned out to be a doctored photo of Russian migrant farmers (source).
Like Jughead, at this point most like all we can hope for is the ID and return of his remains. I've actually been to the Joint POW/MIA Accounting Command (now Defense POW/MIA Accounting Agency) lab on Hickam, the work that organization is doing is impressive, but they can only focus on the remains that have been found or handed over which hasn't happened in Robertson's case. Until then, all we can do is hope...
Cheers! M2