I was intrigued by this question: What do you do if a genkoyoshi line ends with e.g. す。」? and its answer.
I'm not any good at this 原稿用紙 but I remember being told for some types of forms (which I thought followed the same rules) that you need to put the [濁点]{だくてん} (for some reason always called ten-ten and maru in the classes and contexts I heard them) into separate boxes. Was I being misled / is this still current practice for some sort of form?