Chancellor Alistair Darling is standing by his version of events of how discs containing the personal details of 25 million people went missing.
The Treasury said there was nothing in e-mails released on Thursday to contradict the chancellor's account.
The e-mails suggest a senior manager was involved - something not mentioned in Mr Darling's statement to MPs.
BBC Political Editor Nick Robinson said:
"I am told that when he spoke to the Commons the chancellor had not seen the e-mails and had not been told of the potential involvement of a senior official."
"The suggestion that a single 23-year-old on low pay at the Child Benefit Centre in Washington is solely responsible for this saga may suit certain people - including the managements of the NAO and HMRC who have clearly clashed in their accounts of this affair - but it beggars belief."
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