even if you bring the bag back to Hermes shop, the sales cannot and will not directly confirm if the bag is real . This is a skill that belong to the craftsman not sales.
Frankly speaking, 勿貪平,差唔係好多。坦白even hermes won't authentic for you, if the person willing to provide receipt for you then go ahead. Like everything I bought from my frd or even resell , i will provide receipts .