From the Hongkong based, South China Morning Post:
These kids were lucky, a NGO group saw them first. Their stories are in the above overview.
The Indian National Crime Records Bureau states that over 65,000 boys go missing from home every year, only about 40,000 are ever traced. (I think that's conservative, if - as some estimate- over 70% of Indians are still living in poverty, then the likelihood of every missing boy being reported to any authority is small)