Since then, it is said to have focused on helping unwed pregnant women and mothers in distress.
Police have confirmed that they are investigating at least three complaints, but the charity - which was set up by the famous missionary in Kolkata in 1950 - has denied that any children had been sold.
A nun, identified as Sister Koncilia, and a staff member, Anima Indwar, were arrested in connection with trafficking.
The shelter home is administered by the Missionaries of Charity, which was founded by Nobel laureate Mother Teresa.
The Times reported on Monday that the last of the four, the six-month-old boy, had been located and recovered.
"Taking cognisance of the recent cases of illegal adoptions carried out by Missionaries of Charity in Jharkhand, [minister for women and children] Maneka Gandhi has instructed the states to get childcare homes run by Missionaries of Charity all over the country inspected immediately", the ministry said in a statement.More news: Blue carpet glamour: Cher and Meryl Streep stun at Mammia Mia premiere
"We are working on verifying them", Gupta said.
Approximately 2,300 CCIs have been linked to the CARA since December 2017, while about 4,000 more are still pending for linkage.
Women and child development minister Maneka Gandhi has said all childcare institutions should be registered and linked to the country's central adoption authority within the next month, with the Supreme Court having made the order at the end of a year ago.
The Missionaries of Charity stopped facilitating adoptions in India in 2015 after government reforms that removed obstacles for single, divorced or separated people to adopt children.
The Catholic Bishop Conference of India general secretary Theodore Mascarenhas had claimed that the sister told the MoC lawyer on July 11 that she was not involved in the baby selling racket and her statement was taken "under pressure" by the police.
Teresa, who died in 1997, was recognized by the Vatican as a saint in 2016. Kumar explained that even when the order did process adoptions, it never accepted money for them.