The ruling on one who finds money and hands it over to a charitable organization with the intention of giving it as charity

If one finds money on the road and hands it over to a charitable organization with the intention of giving it as charity on behalf of that person?
No, that is not valid. He must announce it, or else give it to the person in charge of lost property. If it is a responsible organization, he gives it to them; otherwise, he must announce the lost item.
Q: Is witnessing obligatory?
A: The apparent meaning of the hadith is that it is obligatory: The default ruling for commands is obligation. However, it may be said that his silence in many hadiths indicates that it is recommended; because in the hadith of Zayd ibn Khalid in the two Sahihs and many other hadiths, there is no command to witness. So it may be said that this indicates that the intended meaning of witnessing is recommendation and preference.