S1·E489 Varsha In Bair Office

Varsha is glad to learn that the alien caught by the BAIR is not Vasant. But she also discovers that there was a two-headed alien caught by the agents very recently, which has now died. She panics and presumes that the body belongs to her lost son, '2015'. Meanwhile, the BAIR agents warn the residents fo the Sunshine Colony, saying that if the BAIR agency finds any evidence that suggests that the residents have been helping aliens, they will be in big trouble. Who is the lost alien, then?