I bought this 6 years ago and it has only been used a few times. It is stored in a cupboard along with all the 15 other LV bags (non-Vernis). Each of which is covered with the protective cover-bag that comes with the LV bags. Discovered this discolourization 2 weeks ago. It wasn't like that a few months ago. All the other LV bags in the same storage cupboard do not have this problem. I took it to the LV shop last week and they told me and insisted that this discolourization is "normal wear and tear". Does anyone have experience with this problem ? Is there a fix to restore the colour ? Can anyone explain why this happened ? Perhaps in more technical (scientifc terms) ?