Meanwhile, the parents of Gurshan Singh were allowed to view the body at a city morgue, two days after the body was found in a suburban area.
The grieving parents who were accompanied by Indian consulate officials to the morgue reportedly spent about an hour with the child's body.
Harpreet Kaur Channa and her husband Harjit Singh Channa were interrogated for over five hours by the Victorian police.
The child was found dead under mysterious circumstances hours after he went missing from family home on Thursday, Mar 4.
The body, which was fully clothed in blue jeans and a grey top, was found by a council worker on the side of a road in Melbourne's northern suburbs, approximately 30 kms away from the home.
The child was in Australia with his family for a holiday. They were scheduled to return to India in a week's time.