robin barton was abandoned behind a santa ana , california , dumpster in november 1989 when he was just four hours old .
now-retired police officer michael buelna found the infant after hearing what he thought were meows coming from the dumpster .
buelna was abandoned as a child , along with his four siblings , by his mother .
he hopes to help barton find his biological mother , sabrina diaz .
barton says he forgives dias and that he was ` blessed with a great family '