I would like to present a possibility (although unlikely) that I hadn't seen mentioned here
A quick summary
12 year old Alexander Walter Roberts went missing from Phoenix, Arizona 7/29/1960
Last seen at his uncle's house on the 1300 block of east Brill but lived with his aunt in the 6400 block of west Cavalier
8th grader at St. Agnes School
*Mom lived in
San Francisco, CA
*Dad lived in Glendale, Arizona
*Known to have relatives in Texas, may have traveled to California or stayed in the Phoenix area after his disappearance
Went missing with a
gold Timex watch with a leather band,
white T shirt, Levi jeans, brown high top shoes, and a
brown wallet
Alexander's height, weight and eye color don't match the UID as he was listed at 4'11"-5'1" about 90-100 lbs with brown eyes. Teenage boys grow quite fast at times, but 4-5 inches plus or minus 20 lbs in less than a year according to when the MVA occurred seems unlikely. Same with the eye color and he was noted to have a scar under his left eye.
However, it appears Alex's hair parts on the far left side, his ears are a similar shape to the UID and in one of his pictures on NAMUS, he's wearing a white T Shirt with a collar that looks similar to the UID photo. I also found it strange that Phoenix, Arizona is hot normally but in a lot of Alex's pictures he's wearing long sleeves or even multi-layers. He went missing with a watch and a brown wallet although those weren't uncommon at the time.
Not sure! Definitely just thinking out loud
Hopefully these young men find their families either way