Police commissioner Gaurav Yadav had formed a Special Investigation Team (SIT) headed by additional deputy commissioner of police (ADCP) Harpreet Singh Mandher.
"The commissioner holds a meeting with the SIT twice a day to keep a tab on the investigation, but no vital clue has been found," sources in the police said.
When contacted, ADCP Mandher told HT that nearly 400 phone numbers have been short-listed as worth watching of the detail of operational phones in the particular area of crime on the fateful night. So far, more than 300 callers have been questioned and verified.
"We are making efforts to track down the accused in the robbery," Mandher said. The police in the adjoining states were also contacted to share details of similar crimes there, but nothing was uncovered.
"The robbers were smart enough and did not leave any clue on the crime spot, which has put the investigation virtually in dark," he admitted.
On the amount of loss, the police said of the 40 lockers robbed, four were not allotted to anybody. However, no estimates can be put forward as some locker holders had not yet reported their losses.
Even after the robbery, some banks in the city are reluctant to spend on security and have failed to install CCTV cameras and night security guards.