I was using it without the cover. There are no markings, but as shown in the image, there are slight folds and sun damage on the edges of the cover. I am also selling the Level 3 textbook, so please take a look if you need it. If you purchase both the Level 3 textbook and this one together, I will sell them for 900 yen (including shipping). Please contact me before purchasing or send a combined purchase request. If you are purchasing this item individually, you can buy it without any prior notice.