Jami` at-Tirmidhi 1373
جامع الترمذي#1373SahihZaid bin Khalid Al-Juhni narrated that the Messenger of Allah (ﷺ) was asked about the lost item. He said:"Make a public announcement about it for one year, if it is claimed then give it to him. Otherwise remember its sack, string, and its count. Then use it, and if its owner comes, give it to him
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
In-book reference: 15:54