1720 - 'Amr ibn 'Awn narrated to us, Khalid informed us, from Abu Hayyan al-Taymi, from al-Mundhir ibn Jarir, who said:

I was with Jarir in al-Bawazij when the shepherd came with the cattle, and among them was a cow that was not one of them. Jarir said to him: "What is this?" He said: "It joined the cattle, and we do not know whose it is." Jarir said: "Take it out. I heard the Messenger of Allah, peace and blessings be upon him, say: 'Only a misguided person shelters a stray animal.'" (1)

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= Also recorded by Muslim (1724), and al-Nasa'i in al-Kubra (5773) via multiple chains from Ibn Wahb, with this chain of transmission, without Ibn Wahb's explanation.
It is also in Musnad Ahmad (16070), and Sahih Ibn Hibban (4896).

Al-Mundhiri said: The correct view is that if one finds a lost item in the Sacred Precinct (al-Haram), it is not permissible to take it except to preserve it for its owner and to announce it indefinitely, unlike lost items in other lands, where it is permissible to pick them up with the intention of ownership. Some said that the ruling for lost items in Mecca is the same as the ruling for lost items in other lands.

Ibn al-Qayyim says: Some differentiate between lost items in Mecca and elsewhere on the basis that people disperse from Mecca, so it is not possible to announce the lost item throughout the year. Therefore, it is not permissible for anyone to pick up a lost item there except by hastening to announce it before the people disperse, unlike other lands.

(1) Sahih due to corroborating evidence, though this chain is weak due to its inconsistency, as we have explained in al-Musnad (19184). Khalid is Ibn 'Abdullah ibn 'Abd al-Rahman al-Tahhan, and Abu Hayyan is Yahya ibn Sa'id al-Taymi.
Also recorded by Ibn Majah (2503), and al-Nasa'i in al-Kubra (5768) via the chain of Yahya ibn Sa'id, from Abu Hayyan, from al-Dahhak, the maternal uncle of al-Mundhir ibn Jarir, from al-Mundhir ibn Jarir, with it. Thus he added to the chain between Abu Hayyan and al-Mundhir ibn Jarir: al-Dahhak, the maternal uncle of al-Mundhir — and it was said al-Dahhak ibn al-Mundhir — and he is unknown.
Also recorded by al-Nasa'i (5767) via the chain of Ibrahim ibn 'Uyaynah, from Abu Hayyan, from Abu Zur'ah ibn 'Amr ibn Jarir, from al-Mundhir ibn Jarir, with it. Thus he added to the chain between Abu Hayyan and al-Mundhir: Abu Zur'ah ibn 'Amr ibn Jarir, and he is trustworthy. So the discrepancy became a matter of uncertainty between a trustworthy narrator and an unknown one, and we do not know which of them it is.