I hear that this certain line of cases does not have standoffs but instead has bumps where the screws should go instead. The problem is that I recently bought one from a store nearby where I live that looks exactly the same and the box has the same labelling (Corsair Carbide Series 300R). The only difference is that this one has standoffs instead of bumps. Should I consider this a mistake from the store and exchange it or did I miss something?