I also use clear boxes, called “shoe boxes” at my local big box store. I started 8-years ago, when I devoted a closet in a new house to them. They’re now everywhere. I often answer a lot of questions with, “in the box in the closet”. Even my guests don’t need more info than that to find what they’re looking for.
I have some I don’t think I use. I’m going to adopt this idea. Instead of dots, however, I think I’ll just use a pen/pencil. Maybe I’ll print space for the marks on my labels.
I just purchased a cheap thermal sticker printer that I may use instead of my label maker. But handwriting labels would be fine too.