We live in a religious suburb of Jerusalem. Near the recycling bins a neighbor had placed a set of Corelle dishes (plates and bowls) in a box hand-labeled "בשרי". I do not know who left them there or why they discarded them. These dishes happen to be exactly the same model of Corelle as we use for our dairy Passover dishes. Many of them have broken over the years. Can the found dishes be kashered to add to our Passover dishes?

Yes. Do hagala three times. All the best.