The court heard on Monday that no semen or male DNA was found on the body of the girl killed on the farm.
The information was part of a list of admissions handed in to the court by the defence team of the boy.
Northern Cape Judge President Frans Kgomo was hearing evidence relating to the murders of Northern Cape farmer Deon Steenkamp, 44, his wife Christelle, 43, and daughter Marthella, 14.
They were shot on April 6, 2012.
The teenager’s lawyer Willem Coetzee read the list of 132 points of admissions into the court record. These facts would not be disputed by the defence.
The boy faces additional charges of raping Marthella and defeating the ends of justice.
Investigating officer Colonel Dick de Waal on Monday also rejected claims by a rightwing woman that she played a part in the Steenkamp murders.
“There is no truth in these allegations,” De Waal testified.