HM Revenue and Customs has confirmed that a further six data discs have gone missing in transit between its offices in Preston and London.
The discs, which were reported missing on 30 October, contained recorded conversations between a member of staff and a customer making a complaint.
Police are still searching for two computer discs containing the details of 25m Child Benefit claimants.
The HMRC says evidence suggests these two discs are still on its premises.
The second lost package, containing six discs, went missing after being sent from a tax credit office in Preston to HMRC's Whitehall headquarters in London.
They were despatched through the same internal mail system used by those who sent the two missing Child Benefit discs, which have not been seen since being posted at HMRC in Washington, Tyne and Wear, on 18 October.
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