Question: May an owner offer a reward to anyone who finds his lost object? May the finder keep the reward?

Short Answer: Yes, according to many contemporary poskim, a finder may accept a reward, but some add that it is preferable for the finder to donate the reward to tz’dakah.

Question: May a person ignore (and not pick up) a lost object that has no identifying features?

Short Answer: While Rav Yosef Shalom Elyashiv zt”l and others ruled that one may ignore such an object, Rav Moshe Feinstein zt”l ruled that a finder must pick up the object and hold onto it until Eliyahu HaNavi comes and the true owner is established.