The value of goods stolen in the £14 million Hatton Garden raid has reportedly increased by a further £7 million after a new victim came forward.
The woman said she only realised her valuables were missing after the trial of the men responsible for the Easter 2015 burglary, according to Sky News.
The gang, with a combined age of 448, carried out the "sophisticated" and meticulously planned break-in over the bank holiday weekend.
A Met Police spokesman said: "In June 2016, police received an allegation of theft from a security box relating to the Hatton Garden burglary in April, 2015. The victim is alleging the loss of a substantial amount of property. The investigation is ongoing."
Before the woman came forward - more than a year after the raid, it was thought valuables worth up to £14 million, including gold, diamonds and sapphires, had been taken. At the end of the trial of the six-man gang, two-thirds of the proceeds of the burglary remained unaccounted for.
The gang ransacked 73 boxes at Hatton Garden Safety Deposit in London's jewellery quarter after using a drill to bore a hole into the vault wall.