Narrated Zaid bin Khalid Al-Juhani:
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** A man asked Allah’s Messenger (ﷺ) about “Al-Luqata” (a lost fallen purse or a thing picked up by somebody). The Prophet (ﷺ) said, “You should announce it publicly for one year, and then remember and recognize the tying material of its container, and then you can spend it. If its owner came to you, then you should pay him its equivalent.”
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** The man said, “O Allah’s Messenger (ﷺ)! What about a lost sheep?” The Prophet said, “Take it because it**** is for you, for your brother, or for the wolf.” The man again said, “O Allah’s Messenger (ﷺ)! What about a lost camel?” Allah’s Messenger (ﷺ) became very angry and furious and his cheeks became red (or his face became red), and he said, “You have nothing to do with it (the camel) for it has its food and its water container with it till it meets its owner.”**
[Sahih Al-Bukhari Hadith No. 6112]
Based on this Hadith scholars like Imam Al-Shaafi (may Allah have mercy on him) have said that if one finds a lost item, he should pick it up, announce for it for a year, and if no one claims ownership, the person can use it.