i went and bought an Apple leather case in storm gray for my iPhone 7 plus and when I took it out of the box there were all these streaks on the leather case already. I went back to the store right away and asked the genius who told me that because it's real leather, it'll have these imperfections. I wanted to exchange for another one but they had none in stock unfortunately. Is this normal though? Will they go away as I use it more?