It is narrated from Sayyiduna Zayd bin Khalid al-Juhani (may Allah be pleased with him) that a man asked the Prophet (peace and blessings be upon him) about a stray camel, and he (peace and blessings be upon him) said: "What have you to do with it? It has its water-skin and its feet with it; it eats from the trees and goes to the water until the one seeking it finds it."
Then he asked about a stray sheep, and he (peace and blessings be upon him) said: "It is for you, or for your brother, or for the wolf."
Then he asked about a found item (luqatah), and he (peace and blessings be upon him) said: "Take note of its bag and its number. If its owner comes and identifies it, give it to him; otherwise, it is yours."
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 5232