Martin Steltner, a spokesman of the Berlin prosecutor's office said, that another suspect, who lives in Turkey, "is unattainable for us at the moment".
It is assumed that the second suspect worked as a driver for Ono.
Mr Steltner said it is not clear when they will returne the recovered items to Lennon's house. Things, which are 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 England. In September, an original score for The Beatles' song Eleanor Rigby was removed from another auction in England amid claims it had been stolen. The handwritten score, signed by Paul McCartney, was due to be sold with a guide price of £20,000.