A couple of days back, police recovered chopped off legs at the Givindwadi flower market. The ossification test revealed that the body parts belonged to a male aged around 12.
Later, the boy's father identified the body parts as that of his son, police said.
Sunday morning, some other body parts of the victim were found in a drain, they said.
Bazarpeth police, which was investigating the case, said four suspected killers of the boy had been identified and efforts were on to nab them.