Zayd bin Khalid al-Juhani (may Allah be pleased with him) narrated that a man came to the Messenger of Allah ﷺ and asked about a lost item (something found on the road). The Prophet ﷺ said: "Examine its pouch and its binding thoroughly, then announce it for one year. If its owner comes during that period, give it to him; otherwise, it becomes yours."
Hadith Referenceمسند الإمام الشافعي / كتاب الرهن والقراض والحجر والتفليس واللقطة / 1486
Hadith Takhrijاخرجه البخاري، المساقاة، باب شرب الناس وسقى الدواب من الأنهار (4372) ومسلم، اللقطة، باب معرفة العفاص ولوكاء وحكم ضالة الغنم والابل (1722)۔