من لا يحضره الفقيه, volume 3, page 293

Hadith.4050 - Ibn Mahbub narrated from Jamil ibn Salih, from Abu Abdullah (as), who said: I asked Imam (as) about a man who found a dinar in his house. Imam (as) said: "Does anyone else enter his house?" I said: "Yes, many people enter." Imam (as) said: "Then it is considered lost property (luqata)." I asked: "What about a man who found a dinar in his locked box?" Imam (as) said: "Does anyone else put their hand into his box or place something in it?" I said: "No." Imam (as) said: "Then it belongs to him."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

Hadith.4051 - Muhammad ibn Isa narrated from Muhammad ibn Raja' al-Khiyyat, who said: I wrote to al-Tayyib Imam Ali ibn Muhammad Al-Hadi (as): "I was in the Sacred Mosque (Masjid al-Haram) and saw a dinar. I reached out to take it, and then I found another one. I searched the pebbles and found a third. I took them and announced them, but no one claimed them. What do you advise regarding this matter?" Imam (as) wrote in reply: "I have understood what you mentioned about the dinars. If you are in need, then give one-third of them in charity. But if you are wealthy, then give all of them in charity."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.