It should be authenticated. Recently I saw a bag with those type of grommets (on the strap) that was authentic but usually Coach's grommets don't look like that on the backside.
Thanks again whateve for helping authenticate the bag! I checked my other bags and I noticed my Lula has the same grommets! The Lula was authenticated here years ago. The interesting thing is that the number on both bags start with F5D. Could this type of grommet be specific to that code? (Maybe a factory error?)