Authenticate this YSL College bag PLEASE!

  1. Please help! Does this bag look authentic? The seller has good feedback on Ebay but the seller purchased it secondhand and mentioned she is not 100 % sure if it is real or not since she did not buy is from the boutique itself so she is selling it cheaper than retail price. She mentioned she did buy if from a reputable seller though. I just sent her some messages asking about the serial number and I am waiting for her to get back to me. Thank you for taking the time to read!
    yslrealorfake.jpg s-l1600.jpg s-l1600 (2).jpg s-l1600 (1).jpg s-l1600 (3).jpg
  2. Can u post a pic of the back