WASHINGTON: Moon dust samples gathered by Neil Armstrong during the Apollo 11 lunar mission have been discovered inside a California lab warehouse after sitting in the dusty storage unnoticed for over 40 years.Vials of Moon dust brought back to Earth by Armstrong and Buzz Aldrin - were found last month by an archivist while tidying up a storage space at the Lawrence Berkeley National Laboratory."We don't know how or when they ended up in storage," Karen Nelson, who made the surprising discovery, said in a statement from the laboratory.When Apollo 11 returned from its historic flight in 1969, the Moon rocks and lunar soil collected by Armstrong and Aldrin eventually found their way to some 150 laboratories worldwide.One of those was the Space Sciences Laboratory in Latimer Hall on the UC Berkeley campus.After the experiments were conducted and papers were published, those samples should have been sent back to NASA.Instead they wound up in storage, where they sat collecting dust until they were discovered more than four decades later.Nelson uncovered the Moon dust - about 20 vials with handwritten labels and dated '24 July 1970' - last month while reviewing and clearing out artifacts from the lab's warehouse.