Four witnesses were expected to testify at the state capture inquiry on Tuesday.
The witnesses include investigator Patrick Mlambo and Richard le Roux, who inspected properties where security upgrades were installed for high-profile people.
Another witness spoke on Vytjie Mentor’s evidence.
A senior National Prosecuting Authority advocate who criticized the SIU report into Bosasa recommending prosecution is also anticipated.
The Zondo Commission on Monday heard that officials had failed to act on evidence given to them by the SIU.
Clint Oellermann was the lead investigator tasked with scrutinising Bosasa’s contracts with the Department of Correctional Services.
But the prosecution, recommended in that report, stalled until earlier this year.
The SIU says action could have been taken against Bosasa officials ten years ago