Rahul went to the CBI office here and handed over the documents belonging to Sheena, CBI officials said.
Those are the documents with which Sheena was "blackmailing", a CBI source said.
"Rahul Mukerjea is an important link in the murder of Sheena Bora as he has provided several important materials to the investigators against the accused in the case," the source added.
Meanwhile, the police custody of Peter, who was arrested on Thursday last, will end tomorrow and the CBI is expected to seek further remand of his, a CBI officer said.
On Friday, Peter was charged with murder and criminal conspiracy by the CBI, which said he had played an active role in the killing.
Other prime accused, Indrani Mukerjea, her former husband Sanjeev Khanna and former driver Shyamvar Rai, have been remanded to judicial custody till December 3, police said.