I picked one of these up for at a garage sale for 55 cents for my iPad Air 1 and it does not fit. It is an official Apple Branded one. My question is, what iPad is this thing supposed to fit? I got it a while ago, before the iPad Pro so does it fit an iPad Air 2 or an iPad 4? There is no ID / or Apple number on it to research it (unless I am missing it). Thanks a lot!