http://www.charleyproject.org/cases/f/felix_ruben.html
http://www.charleyproject.org/cases/b/barnett_richard.html
http://www.charleyproject.org/cases/f/fair_curtis.html
http://www.charleyproject.org/cases/c/cannon_jason.html
There may be one more but these are the ones I can remember. Not exactly like DeOrr except they are 2 years old and vanished with no resolution.
Thank you for posting these. IMO, not similar to Deorr; these all went missing from a family home. Each of the individual circumstances were different , and in some, family members suspected. To me, when there are suspects, the disappearance is not "without a trace." Your way of putting it "without resolution" is more accurate. JMO. Also, five boys missing over a period of 36 years.