When the mass production was no longer necessary and the original slavers thought they had a pure line of revenue, private breeders acquired females and started their own breeding, then public breeding was allowed.
Beings like us, two eyes, arms, legs, bipedal with our features and attributes are very rare in comparison to the majority of alien species, so when another hundred years had passed, babies started to be born with pink, tan, red, yellow and black skin… throwbacks to their human genetics. It turns out that it was easier to suppress and substitute these attributes in the genetic code and it was done that way. The information is still there, it's just … recessed.
The anomalies were tested by the Galactic Consol and compared to existing races and it was then, the truth was revealed. Rishan are human. Records were confiscated and it was proven without a doubt.
