Oh, man, this is one of those minor annoyances in life that drives me crazy. Be careful if you try to pull the sticker off; it can stretch the clear plastic on the box and it will look funky. I typically give just peeling them off a try. Sometimes you get lucky, and they come right off. You can usually tell if they are going to tear apart and leave a mess behind as soon as you start trying. If they do, it’s time for the secret weapon - WD40. You can also use products like Goo Gone that are designed to remove adhesives, but WD40 works too, it is cheap, and almost everyone already has some around. Just make sure that you remove the cover art and manual first so that they don’t get any on them. I like to use a lint free rag and spray a generous amount of WD40 onto it, then “rub” the sticker off. Don’t go crazy, it still takes a little time. It also helps if you dab the sticker with a WD40 soaked rag and get it damp, then let it sit for a few minutes before you start the removal process.