Just flip it over and give it a good shake. The shape orients the screws so that they can fall into the slot at the bottom ready for you to take them out without poking your fingers. It is conceptually based on a slot orienter for roofing nails. The lid is sized for large mixed nut containers and 2 Kg peanut butter jars.

I didn't parameterize the design but can and post the CAD files if you are not able to find the right jar size.