I was checking out Reddit’s Unresolved Mysteries section and found a discussion about Samuel Byrd, with a link to this 2014 article about Connecticut disappearances. The article provides a few more details about his disappearance — not much, but I had almost nothing to go on before.
The article claims Samuel disappeared in 1976, but the NCMEC gives the year as 1977. Frustratingly, in the “date last seen” for Samuel on his NamUs page, it says 1977, but in the “circumstances of disappearance” it says 1976.
Perhaps his family, who didn’t report him missing till around 2014 or maybe a year or so before, simply doesn’t remember the year, But he is said to have gone missing just after his high school graduation, and it should be easy to figure out when that was. This piece of information would suggest the later year, as most people graduate at age 18 or sometimes 17, and Samuel would have been 17 years and 11 months in June of 1977. However, people occasionally graduate at 16.
So I have one source that says 1977, one source that says 1976, and one source that can’t make up its mind.