The matter was postponed to April 17 for the results of the multiple drug tests they took, Warrant Officer Kay Makhubela said.
The court was holding a preliminary inquiry in terms of the Child Justice Act.
Makhubela said the inquiry would determine whether the boys would go on trial.
The boys, who cannot be named because they are minors, were arrested in connection with the murder of Thandeka Moganetsi, 15, and Chwayita Rathazayo, 16.
The girls were found dead in a field in Dobsonville in February.
They were both in their George Khoza Secondary School uniforms when they were found with cuts on their hands and necks.
Three black candles and two new razor blades were found at the scene.
The murder was believed to have been linked to a satanic ritual.