The payroll details of around 180 NHS staff lost in a street in Stevenage have been recovered by police.
Capita, the company who run the NHS payroll service, have confirmed documents relating to Leicester NHS Trust have now been found.
On Friday 21 March the papers were discovered in a street in Stevenage. The police were informed.
The information includes names, addresses, bank details and national insurance numbers.
A spokesman for Capita said: "I can confirm that such documents were indeed recovered by the police, but we don't know, at this stage, how they left official premises."
"As soon as we became aware of the discovery of the documents by the police we launched a through and detailed investigation, involving high-level security specialists, which is ongoing.
"We are working closely with the Trust to ensure that the individuals whose personal details may have been seen by unauthorised people are fully informed."
This is the latest in a serious of public sector data losses, although this time it is an independent company contracted by the Government who have taken responsibility for the loss.
Kathy Renacre of the NHS Trust consortium said: "We demand that the highest possible standard of care is taken with all employee personal data. Any breach of those standards is completely unacceptable.
"We will get to the bottom of what has happened and make sure that it can never happen again."
The Department of Health has declined to comment on the matter, citing it as a "local matter".