If you bought a designer bag costing £1k, You used it once and since been inside the dust bag and it's box. The next time you take it out, you see the metal hardware logo, discoloured, cloudy looking, oxidised. What would you expect from the designer brand, in terms of resolving it?
Would you expect them to tell you to pay to have the hardware replaced? When you have all your receipt, proof of purchase etc. Very obvious from looking at the bag that it's in perfect condition.