A large team of detectives and forensics officers are making "slow and painstaking" progress as they pore over every aspect of the raid, according to the Met.
In the latest statement, police also revealed thieves cracked into about 60 to 70 safety deposit boxes.
Initial reports had suggested the gang drilled into more than 300 boxes filled with cash and gems.
A spokesman said: "Detectives and scenes of crime officers are currently carrying out a forensic examination of the scene at Hatton Garden Safety Deposit Ltd.
Examination: A forensics officer at the scene (Picture: Getty)
"This is a slow and painstaking process involving forensic examination, photographing the scene and recovering exhibits in meticulous detail in order to preserve the evidence.
"Officers anticipate this process to take approximately two days.
"At this stage it is believed that approximately 60 - 70 safety deposit boxes were opened during the burglary. Officers are working closely with Hatton Garden Safety Deposit Ltd to establish the identities of those affected.
"Police will be contacting victims directly as and when they are identified."
A gang of thieves raided Hatton Garden Safety Deposit Ltd at some point over the long weekend, reportedly boring through walls and abseiling down a lift a shift to get into the vault.
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London jewel heist: Hatton Garden crime scene investigation will be 'slow and painstaking', say police