Are you dealing with a lot of boxes and don’t know what’s in them? Then create and keep a “Box Inventory”.
Simply make a document with numbers down the left column and give yourself at least two blank lines next to each number for description purposes.
Then with a Sharpie or sticker, label each box with a number (you should also write the contents on the box itself) and synchronize these numbers and information with your Box Inventory form.
If it helps, take a photo of the inside of your box too. When finished copy it and put it in a safe backup space and/or give it to a loved one.