First and foremost, authentication is key. Before you add to the cost of the bag by undertaking repairs you will want to be sure that you have a legitimate bag in hand. Many here recommend bababebi, and I wholeheartedly concur. If you want to combine authentication with repair, another option is to simply take the bag to a Hermes boutique and have them 'spa' the bag. The issues with this route are primarily two: they may refuse to work on the bag either because it is not an authentic Hermes product or because a third-party has undertaken repairs not approved by Hermes. The second issue is that should they agree to repair the bag, the wait time is significant (months) and you will be without your bag for a length of time.
With an authentic bag in hand, there are third-party service providers who can make most necessary repairs; the consideration here is that presumably Hermes' lifetime service is one of the reasons to seek out its products, and you may void that opportunity by using an outside service. Some members have indeed used outside services for repairs and then subsequently had their bags accepted for spa at Hermes but I'm simply identifying the issue.
As to the bag in question, I'm not one to fuss about the box, dust bag and the like; to me, it's the bag itself that I'm purchasing and carrying, and the other accoutrements can be obtained elsewhere if needed. To my eye, a good cleaning will help this bag to look its best pre-loved self, the question is whether there are other options in better condition that won't require extensive spa work. It depends on what you're looking for, first Hermes bag for a try out? Steal of the century? Smitten with the Lindy? Whether the bag is 'worth it' might need a bit more teasing out of what you're looking to accomplish. HTH!