Musnad Ahmad 28:458

Yazid narrated to us, Muhammad ibn Ishaq informed us, from ‘Amr ibn Shu‘ayb, from his father, from his grandfather, who said: I heard a man from Muzaynah asking the Prophet, peace and blessings of Allah be upon him—and he mentioned the like of the hadith of Ibn Idris—he said: And he asked him about fruits and what was in their coverings? He said: "Whoever eats with his mouth and does not take a bundle (in his garment), there is nothing upon him. And whoever is found having carried (some away), upon him is its price twice over and a disciplinary punishment. And whatever is taken from the threshing floor, upon it is the cutting (of the hand), if what is taken of that reaches the price of a shield." He said: "O Messenger of Allah, what about what we find on the public road of lost property?" He said: "Make it known for a year; if its owner comes, (give it to him), otherwise it is yours." He said: "O Messenger of Allah, what about what we find in ancient ruins?" He said: "In it, and in buried treasure (Rikaz), is one-fifth."