It was narrated from 'Amr bin Shu'aib, from his father, that his grandfather said: "The Messenger of Allah (ﷺ) was asked about Al-Luqath.[2] He said: "That which is found on a much-traveled road or in an inhabited village, announce it for a year. If its owner comes (and takes it, well and good), otherwise it is yours. That which was not found on a much-traveled road or in an inhabited village is subject to the Khuns, as is Rikaz."'[1]
Source: sunnah.com
Other translations
Arabic
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ عُبَيْدِ اللَّهِ بْنِ الأَخْنَسِ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ سُئِلَ رَسُولُ اللَّهِ صلى الله عليه وسلم عَنِ اللُّقَطَةِ فَقَالَ " مَا كَانَ فِي طَرِيقٍ مَأْتِيٍّ أَوْ فِي قَرْيَةٍ عَامِرَةٍ فَعَرِّفْهَا سَنَةً فَإِنْ جَاءَ صَاحِبُهَا وَإِلاَّ فَلَكَ وَمَا لَمْ يَكُنْ فِي طَرِيقٍ مَأْتِيٍّ وَلاَ فِي قَرْيَةٍ عَامِرَةٍ فَفِيهِ وَفِي الرِّكَازِ الْخُمْسُ " .
sunnah.com