In the first image, marked with pink markers, we have the gold colored fastener that is used for WiFi, Storage, and the Audio Board. This is an M2 3.0mm fastener with a T5 head which is 4.5mm in diameter and 0.7mm thick. The right-most fastener in the top three spares above the Mainboard is an extra of these.
In the second image, marked with yellow markers, we have the gray colored fastener that is used for the Mainboard. This is an M1.6 1.5mm fastener with a T5 head which is 5.5mm in diameter and 0.6mm thick. The left-most fastener in the top three spares above the Mainboard is an extra of these. These are also used for the Webcam.
In the third image, marked with blue markers, we have the silver colored fastener that is used for the Hinges where they attach to the Bottom Cover. This is an M2 4.0mm fastener with a T5 head which is 4.6mm in diameter and 0.6mm thick. The middle fastener in the top three spares above the Mainboard is an extra of these.
The five fasteners that attach the Bottom Cover to the Input Cover are captive (meaning they don't come out), but in case you somehow pulled out and lost one, they are M2 5.75mm with a T5 head which 4.6mm diameter and 0.8mm thick.