Suwayd bin Ghafla reported,

I went out with Zayd bin Sawhan and Salman bin Rabia, and I found a whip. (Ibn Numayr said in his version, "I picked up a whip and took it.")The two of them said, "Leave it."I replied, "I will not leave it for the wild beasts to devour. I will take it and make use of it."So I went to Ubayy bin Kaab and asked him about this, recounting the matter to him.He said, "You did well. During the time of the Messenger of Allah ﷺ, I found a purse containing a hundred dinars. I brought it to him, and he said to me, 'Announce it for a year.'So I announced it for a year, but I found no one who recognized it. Then I brought it to him again, and he said, 'Announce it for another year.'So I announced it, then brought it to him once more. He said, 'Announce it for yet another year,' and added, 'Take note of its number, its container, and its tie. If its owner comes and tells you the number, the container, and the tie, hand it over to him. Otherwise, make use of it.'"He said, "This is a good and authentic hadith."

Tirmidhi 1375

Sahih

حدثنا الحسن بن علي الخلال حدثنا عبد الله بن نمير ويزيد بن هارون عن سفيان الثوري عن سلمة بن كهيل

عن سويد بن غفلة قال

خرجت مع زيد بن صوحان وسلمان بن ربيعة فوجدت سوطا قال ابن نمير في حديثه فالتقطت سوطا فأخذته قالا دعه فقلت لا أدعه تأكله السباع لآخذنه فلأستمتعن به فقدمت على أبي بن كعب فسألته عن ذلك وحدثته الحديث فقال أحسنت وجدت على عهد رسول الله ﷺ صرة فيها مائة دينار قال فأتيته بها فقال لي عرفها حولا فعرفتها حولا فما أجد من يعرفها ثم أتيته بها فقال عرفها حولا آخر فعرفتها ثم أتيته بها فقال عرفها حولا آخر وقال أحص عدتها ووعاءها ووكاءها فإن جاء طالبها فأخبرك بعدتها ووعائها ووكائها فادفعها إليه وإلا فاستمتع بها قال هذا حديث حسن صحيح

الترمذي 1375صحيح
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Darussalam 1375
Tirmidhi 1375