The diaries were put on display at
Police said a 58-year-old man had been arrested on suspicion of handling stolen goods.
The items were stolen in
Detectives said much of the haul was confiscated from an auction house in
Ono identified the objects from photos she was shown at the German consulate in
The suspect was arrested on Monday in
Martin Steltner, a spokesman for the
It is understood the second suspect used to work as a chauffeur for Ono.
Mr Steltner said it was not clear when the recovered items could be returned to Lennon's estate.
Memorabilia connected to the Beatles can fetch huge prices at auction.
In February, a leather jacket believed to have been worn by Lennon sold for £10,400 at an auction in
In September, an original score for The Beatles' song Eleanor Rigby was removed from another auction in
The handwritten score, signed by Paul McCartney, was due to be sold with a guide price of £20,000.