Ubaidullah bin Badr narrated that he traveled on the roads of Syria and found a pouch on the way in which there were eighty dinars. Then he mentioned this to Umar bin Al-Khattab (may Allah be pleased with him), so Umar (may Allah be pleased with him) said: Announce it at the doors of the mosque, and inform everyone who comes from Syria for a year, and when a year has passed, then the pouch is yours.
Hadith Referenceمسند الإمام الشافعي / كتاب الرهن والقراض والحجر والتفليس واللقطة / 1487
Hadith Takhrijصحیح اخرجه البيهقى 6 / 193 - وفى المعرفة السنن والآثار له (3818) - ومالك في الموطا، الأقضية، باب القضاء في اللقطة۔