Take note if there is absolutely no mention that the bag is authentic! If so, ask the seller to verify that they are offering an authentic product. If they fail to respond to your request, this may be a sign that they don’t want to incriminate themselves.
But be careful! Just because the seller claims it’s authentic does not mean that it is.



[...] The stitching 3. The bag does not look like any other bag 4. Replicas 5. Photos quality 6. Authenticity mention 7. Credo Patch 8. Fixtures 9. Zippers 10. Lining 11. “Made in China” 12. [...]