From this M.Y. answer:
On the first two days of Sukkot, the mitzvah can be fulfilled only using one’s own Four Kinds. As such, if using someone else’s set, it needs to be given as “a present, conditional on its return.” You can then use the set—your set—and then you return it, as a gift, to its original owner.
For many years, the shul bought an arbah minim set to be used by all those who attended shul services on Succot. If the shul uses part of the membership dues to pay for the set, would this mean that every member is automatically an owner of the set, thus making the above procedure unnecessary? I.e., one person uses the set, and when he is finished, he can just pass it to the next person without any declaration?
Or is the shul the owner? If so, who "owns" it - the rabbi? If it is him, after he gives it to the 1st person, does he have to return it to the rabbi, or can he pass it to the next person, directly?