I stored it in a dark place as I had no opportunity to use it. It was unopened, but when I checked it for listing, I saw that the part circled in red in photo 3 looked a little brown, so I opened it. I thought it wasn't dirt because it was unopened, but I wiped it a little, but it didn't come off. It seems to be from the beginning. Also, there are what appear to be tape marks on the surface. (Light blue part in photo 3)