Blast, I remembered two things.
#1 A duct tape card.
Small enough for a shoebox, and multipurpose.
#2 A "work light"
There is a category of lighting devices that are not flashlights nor headlights. You attach them to something like a backpack, a car, or a piece of furniture. And ,of course, can be put on a shelf or table.
My "little baby" is actually an emergency doctor. LOL. She works shifts, and has to drive at midnight which worries me a great deal. So, every once in a while I give her a gadget for safety.
A few months ago, I gave her a small flashlight with a carabiner which she can attach to her keys. The flashlight is powerful for its size. This last week, I gave her a tiny flood light which has two ways of attachment, a carabiner and a magnet. It works on AAA batteries. If power goes out the night before exam (which happened to one of my kids) she can hang two of these lights on the right and left and will be able to read books. If an earthquake or other SHTF, these lights are going to make a difference. It is no more than the size of a box of matches (~ 2x1.5 inches), but gives an impressive output.
So, you may go visit your dollar store or hardware store and check the lighting options. You will be amazed of the variety of these little gadgets. You and I live on opposite sides of the planet , but global trade has made our stores so similar.
I bought for myself a few lights that are slightly bigger, and used them for DIY projects around the house. They are different in shapes and sizes but they are not too big to be EDC if you wanted. And they all have two ways of attachments (magnets + carabiner or hook) in addition , of course, to putting them on a table. And they are great.