The lost documents contained details about a British warship (File).
Britain said it had found no evidence of espionage connected to the discovery last month of a wad of secret papers at a bus stop which contained details about a British warship and Russia's potential reaction to its passage through the Black Sea.
The classified documents were discovered in southern England by a passer-by.
Defence minister Ben Wallace said in a statement on Monday that an investigation into the loss had confirmed how the papers were lost, and said the person responsible had their security clearance suspended.
"The investigation has found no evidence of espionage; and has concluded there has been no compromise of the papers by our adversaries," Wallace said.
"The investigation has independently confirmed the circumstances of the loss, including the management of the papers within the Department, the location at which the papers were lost and the manner in which that occurred. These are consistent with the events self-reported by the individual."
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