Chosen Solution

My laptop already lost 2 Screws, one near the screen and the other one at the bottom part. Today i just found another screw fall from my laptop and i’m sure it doesn’t fit the missing two. This one looks smaller and quite short. Any idea which one is it? Or does anyone have a ‘blue print’ which screw belongs where? Thanks.

I was wondering if anyone has worked on your laptop lately? If so, they may have put the screws in incorrectly. Another possibility is that the remount screw anchors have broken and causing the screws to fall. I am including images as well for you to look at.