Sunan Ibn Majah, Volume 1, Book 4, Hadith 766 (DarusSalam) ⓘ
It was narrated from 'Amr bin Shu'aib from his father, from his grandfather that: The Messenger of Allah forbade making lost-and-found announcements in the mosque.
حَدَّثَنَا مُحَمَّدُ بْنُ رُمْحٍ، أَنْبَأَنَا ابْنُ لَهِيعَةَ، ح وَحَدَّثَنَا أَبُو كُرَيْبٍ، حَدَّثَنَا حَاتِمُ بْنُ إِسْمَاعِيلَ، جَمِيعًا عَنِ ابْنِ عَجْلاَنَ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، أَنَّ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ نَهَى عَنْ إِنْشَادِ الضَّالَّةِ فِي الْمَسْجِدِ .
also referenced under: Hadith 766 (Reference) & Book 4, Hadith 32 (In-Book)