MI6 failed to hand over a lot of Gareth Williams's belongings during Scotland Yard's painstaking investigation into the spy's death mystery, an inquest heard today.
Detectives discovered only yesterday that secret services found computer memory sticks in his office and a North Face holdall like the one Mr Williams was found in.
MI6 also searched the spy's "electronic media" without telling police, the officer leading the inquiry said.
Family lawyer Anthony O'Toole asked Detective Chief Inspector Jackie Sebire if she should have been told about the belongings in 2010.
Ms Sebire told Westminster Coroner's Court: "I would have expected to have been told."
She added that she had no knowledge of the existence of memory sticks in his cabinet at work.
"What I knew was that Gareth's email accounts had been checked but I did not know that other media had been checked," Ms Sebire said.
She said she was "not surprised" that Mr Williams had left memory sticks at his office, "given his line of work".
The inquest is hearing its last day's evidence about the 31-year-old's death in August 2010.
He was found naked, curled up in a padlocked holdall in the bath of his flat in Pimlico, central London.
Pathologists said yesterday that he would have suffocated within three minutes after getting inside the bag.
Poisoning and asphyxiation are the "foremost contenders" in solving the death riddle, they added.
Williams was found dead in a Government flat in Pimlico in August 2010.
After excelling at university at mathematics, Williams worked as a cipher and codes expert at the Government listening station, GCHQ.
Williams was then seconded to work at the Secret Intelligence Service headquarters in Vauxhall, London.
CCTV captures Williams entering Holland Road Tube Station on the 14th August 2010.
Caught on CCTV at Holland Road Tube Station the same day.
Seen the next day on CCTV in Hans Crescent, London
His body was found in a holdall in this Pimlico flat on the 24th of August 2010.
Williams' funeral was attended by Sir John Sawers, head of SIS.
Screengrab from a video reconstruction showing a yoga specialist trying to lock himself in a sports holdall unaided
Screengrab from a video reconstruction showing a person trying to close the zip and padlock themselves in a sports holdall unaided