My mini has the same issue. It's in Noir and in Swift and it started showing the same problem =(Supplementary on what I mean the marks, it bulged up where the buckles are, not sure you can see clearly on the photo, is where I am pointing at. Wonder the same issue also have with other leathers.
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Now, when I am storing it, I put a little cloth inside the pockets. I'm not if it´s gonna be enough, though. I bought it october last year.

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