Buried things in civil law refer to things that are hidden in other things and are not easy to find from the outside. Buried things have the main thing, but everyone is unknown, not a non-owner. Cultural relics with historical, artistic and scientific value are not Belonging to the burial. According to the above definition, which of the following is buried things? ['Lao Zhang saw Lao Li bury a bag of things, and Lao Zhang dug it out without notice.', 'A leather bag found by Lao Zhang on the bus.', 'Lao Zhang excavated an 80% new iron hoe while cultivating the land.', 'An abandoned computer picked up by Mr. Zhang in the garbage dump.']