Praise be to Allaah.
What you and anyone else who finds valuable lost property should do is to announce it for one full year in the places where people gather, two or three times each month. If it is identified by the owner, then hand it over to him, otherwise the finder can keep it after one year, because the Prophet (peace and blessings of Allaah be upon him) gave instructions to this effect. An exception is made in the case of lost property found in Al-Haramayn (Makkah and Madeenah) – the finder cannot keep it, and it should be announced indefinitely until its owner is found, or the finder can hand it over to the authorities in charge of the Haramayn so that they can keep it for the owner, because the Prophet (peace and blessings of Allaah be upon him) said concerning Makkah, “Property lost in Makkah is not permissible for anyone except its owner.” And the Prophet (peace and blessings of Allaah be upon him) said: “I have made Madeenah sacred just as Ibraaheem made Makkah sacred.” The authenticity of the Hadeeth is agreed upon.
But if the property is of insignificant value and the owner will not be bothered about it, such as a rope or shoelace or a small amount of money, then the finder does not have to announce it, and he can make use of it or give it in charity on behalf of the owner. This does not apply in the case of lost camels and other animals that are safe from small predators such as wolves etc.. It is not permissible to keep these animals, because the Prophet (peace and blessings of Allaah be upon him) said to the one who asked him about that: “Leave it alone, for it has its feet and its water, and it can eat the trees until it finds its owner.” (Agreed upon).
And Allaah is the source of strength.