“old man” thanks for your information! How does one get hold of this book (sefer) ?
BY THE WAY- just to show that Rashi was quite familiar with books who were NOT gemoro or halachic- he mentions “sefer josef ben gurion” on daf 43A in berochos (see Rashi “shemen artzeinu”). for those who are unfamiliar with “josef ben gurion”, he is Josephus and this is based on his book.