I was wondering if isotopes were ever done on him at the chance he was from somewhere else? I recently learned about the orphan trains that didn't do through background checks on adoptees but that ended in 1929 almost 30 years prior to boy in the box. It is also possible if he was adopted that it could have been legal. Could he even have been a hospital kidnapping victim? There is also the theory he was being brought up as a girl being his hair was cut and he wasn't dressed when found. Frank Bender developed this theory due to the choppy last minute hair cut. Maybe his mother had a mental illness and had wanted a girl? Also his parent could have been on the run and disguised him as a girl. Another thing I wondered was why did they do a bust for what his father may have looked like when it is possible his father wasn't aware he had a child. The hat and hankerchief could be unrelated. If the foster home theory rings true it's possible his mother was underaged or unwed. From what we do know is that he was likely born in a hospital and not undocumented (like a home-birth or homeless mother) is because he has potential surgical scars on his groin, chest, and ankle. What condition would cause such surgeries?
4UMPA
A thought I had was if he does get identified, since this case was 60 years ago, that his family might not want to release his name to not have their family publicly associated with a child's murder. But would they have that opinion in an older case like this? If he was adopted illegally we may never know the identity of his killer.