I was wondering if the Ancient Books such as the Illiad and Odyssey and the Aeneid were a part of the Library. Besides word of mouth, how did they survive the destruction (if they were a part of the collection of the Library)?
Not to forestall further answers to this specific question, but the question of what was lost in the Library of Alexandria is a common one (if a little different to yours). /u/XenophonTheAthenian's answer to that question may be helpful in answering this one - hope that helps!