The Messenger of Allah (SWAS) prohibited taking the find of pilgrims. Ibn Wahb said : One should leave the find of a pilgrim till its owner finds it.
Sunan Abi Dawud Book 10, Hadith 19
← Previous Hadith The Prophet (ﷺ) said: He who hides a stray camel shall pay a fine, and a like compensation with it.

Sunan Abi Dawud Book 10, Hadith 18 Next Hadith → I accompanied Jarir at Bawazij. The shepherd brought the cows. Among them there was a cow that was not one of them. Jarir asked him: What is this? He replied: This was mixed with the cows and we do not know to whom it belongs. Jarir said: Take it out. I heard the Messenger of Allah (ﷺ) say: No one mixes a stray animal (with his animals) but a man who strays from right path.

Sunan Abi Dawud Book 10, Hadith 20