Detailed here are some of the more prominent developments that have made news since the Beaumont children disappeared. None of them has produced a result. South Australia Police still receive leads on a weekly basis and still have an officer assigned to the case.
In September 1966, a policeman in the small Victorian country town of Kaniva was at the centre of a literal case of crossed wires, when he thought he overhead two women talking about the Beaumont children. More information on this story.
In November 1966, the Dutch psychic Gerard Croiset arrived in Adelaide to try to locate the missing children by psychic methods. His earlier attempts to assist the case from overseas had come to nought. After investigating on the ground, he said that the remains of the children were under the concreted remains of a warehouse. Over 30 years later his theory was finally disproved. More information on this story.
In February 1968, the Beaumonts received letters that were purportedly sent by their eldest daughter. The letters suggested that they travel to Dandenong, a Melbourne suburb, where their children would be returned to them. It was a cruel hoax. More information on this story.
The scrawlings of an eccentric old lady caused a stir of excitement in March 1986, when newspaper clippings found in an Adelaide council rubbish dump appeared to give a give a lead in the search for the children. The lead was discounted within 24 hours but seemed in the meantime the most significant development in the case so far. More information on this story.
In February 1990, following information received during investigations into the activities of convicted murderer Bevan Spencer von Einem, South Australian police searched the Myponga Reservoir for the remains of the Beaumont children. Nothing was found. More information on this story.
In August 1997, retired detective Stan Swaine caused some excitement when he claimed that a woman living in Canberra was Jane Beaumont. The woman, publicly identified only as "Susan", had falsely come to believe that she was Jane Beaumont while been treated for child sexual abuse. More information on this story.
In November 2000, a builder renovating a house in the Adelaide suburb of Queenstown found children's remains after lifting a trapdoor concealed beneath some carpet. Police investigators said that the remains were too small to be those of the Beaumont children. More information on this story.