The ruling on one who finds a wallet and returns it to its place

Question:
He says: Honorable Shaykh, may Allah grant you success, I found a wallet containing an amount not exceeding twenty riyals, along with an ID card and some papers. If I return it to the place where I found it, would I be sinful for doing so?

Answer:
No. Since you took it, it has become a trust in your possession that you must not lose. You are required to announce it until you find its owner. Why did you take it? How much did you take in the first place? Once you took it, it entered your responsibility, so you must announce it until you find its owner. You should call out for it in places near where you found it, at mosque entrances, in the markets, or write advertisements and post them on walls in areas where the owner is likely to be or where news of it might reach him. As long as you have taken it, it is your responsibility; it has become a trust in your possession.