من لا يحضره الفقيه, volume 3, page 294

Hadith.4053 - It is narrated from Abu al-Ala, who said: I asked Abu Abdullah (as) about a man who found some money, announced it for a year, and then used it to buy a servant. Later, the owner of the money came and found that the servant purchased with the money was actually his daughter. Imam (as) said: "He is only entitled to take the money and not the daughter. What he is entitled to is his principal amount, as the daughter was previously the property of others."

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

Hadith.4054 - Abu Khadijah Salim ibn Mukram al-Jammal narrated from Abu Abdullah (as) that Dharih asked him about a servant who picks up lost property. Imam (as) said: "What does a servant have to do with lost property? A servant does not own anything for himself, so he should not interfere with it. It is proper for a free person to announce it for one year in a public gathering. If its owner comes, he should return it to him. Otherwise, it becomes part of his property. If he dies, it becomes inheritance for his children and those who inherit from him. But if the owner comes after that, they must return it to him."

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