Police in Oz, as well as state officials in Cameroon, have been officially notified.
Those 14 athletes left the Games village during the event but later turned themselves in to immigration officials.
Indian team official Ravinder Chaudry held a news conference later Friday and said the delegation planned to appeal the ban on Thodi.
The matter has prompted Australia's Border Force to monitor the situation.
Cameroon press attache Simon Molombe told Fairfax Media the athletes' whereabouts were unknown.
"When we got up in the morning, they were not there". "Come in the village, come see them".
Nwanaga, who was reacting to her poor outing, told the News Agency of Nigeria from Gold Coast on telephone that maybe her best was not good enough to win her a medal.
Two Indians - a triple jumper and race walker - are ordered home immediately after needles are found in their athletes' village apartment.
He said two other weightlifters, Arcangeline Foudji Sonkbou and Petit David Minkoumba, had earlier gone missing from the Games, but did not specify when.
It's not known if any of those 11 missing athletes have approached Ready Migration.
Adding insult to injury, the Canadians are coached by former SA men's player and women's team coach, Giles Bonnet. "We have no idea where they are".
Cameroon team manager Victor Agbor Nso told the country's state broadcaster it was unfortunate for the country and its worldwide image.
An Australian Sports Anti-Doping Authority investigator also found a syringe in Mr Babu's bag.
"My opponent didn't show up at the weigh-in this morning", he posted on Instagram.
That one of the Cameroon boxers, Christian Ndzie Tsoye, had failed to turn up for his men's 91kg quarter-final bout on Tuesday particularly saddened Commonwealth Games Federation chief David Grevemberg.
A walkover is the awarding of a victory to a contestant because there are no other contestants or the other contestants have been disqualified or have forfeited.
Gold Coast 2018 chairman Peter Beattie urged the athletes to "stay within the law" and not stay in Australia beyond the expiry of their visas.
"It happens at every Games".
"I feel I can fit into distance running", she said.
"I don't want to be blase".
"When an athlete comes to Australia to compete in a competition we expect them to front up on the field and compete, so we are disappointed about that".
"I have been training so hard, the hardest thing for any athlete is coping with an injury, especially when it means they can't compete in what they have been working towards", Daley said.