The World Federation One Stop Fiqh

Ruling 2596

If a person finds something that cannot remain for a year, he must take care of it for as long as it remains while protecting all those particulars that affect its price. And the obligatory precaution is that he must announce [that he has found the property] during this period. In the event that the owner is not found, the finder can specify a value for it and take it for himself, or he can sell it and keep the money. In both cases, he must continue to announce it. If the owner is found, he must give him its value. But if the owner is not found for one year, he must act according to what was said in Ruling 2585.