Hadith.4058 - It is narrated from Hanan ibn Sadir, who said: A man asked Abu Abdullah عليه السلام about lost property while I was listening.
Imam عليه السلام said: "Announce it for one year. If you find its owner, return it to him; otherwise, you are more entitled to keep it."
He meant lost property found outside the Sacred Sanctuary (Haram).