Look for several verifiable inconsistencies
A reference error, inconsistent presentation or hard-to-identify seller can justify further checks. No isolated detail provides an infallible method, however: houses sometimes change their packaging. Compare the whole product with official information and avoid categorical judgments based exclusively on a photograph or a single feature of the bottle.
Take the concern to the appropriate contacts
Keep the invoice, packaging and correspondence, then contact the seller with clear images and the exact reference. The brand may explain its distribution channels and guide your enquiry. Finding a code online does not authenticate a bottle; codes can be reproduced or interpreted without the necessary product context.