a) have regarded these narrations as authentic refer al-Isaabah vol.3 pg.5 and Hayaatus-Sahaabah vol.3 pg.562-564I am afraid you will have to give either an online reference or a scan of the page since I dont have those books.By the way, I though sunnis believed only Allah had knowledge of the unseen and no one else including the prophet pbuh or Ali or Omer had knowledge of the unseen.