Chosen Solution

I had to tear apart the console because a disk was stuck inside and a small silver peice shaped kind of like a t that says p1 on it and a black L peice with two screw holes one bigger than the other fell out

Both of these are located under the panel that sits just above the power supply, if you’re looking at the PS4 from above, with the fan at the top left and BD-ROM drive at the top right. With this orientation, you’ll notice a pocket to the left of the heat sink which the black piece drops into. If you look at the left side of the plastic frame, you’ll notice the Playstation symbols with the circle actually being a hole which is for a vertical stand, which screws into that black piece. The silver piece is almost directly opposite of the black piece, sitting on the BD-ROM drive near the bottom right corner of it. You’ll probably notice some light markings from the metal contact. I’ve included two pictures below of these in place, please forgive me for the poor image quality. I know this was asked a while back but it took me a while to figure out where these things went since I had no idea where they came from when they fell out. Hopefully this will help someone else who has the same question. Black piece:

Silver piece:

Guys, help me please! This part fell out when I tried to remove the heatsink. Don’t you know where this thing is going?

The black one is on the side of ps4 next to fan …the other one i have issues with it

If anyone else is still wondering what are those for, then as Adam said, black L-shaped part is a holding piece for the screw which mounts vertical stand to the console. Silver springy metal piece is connecting ground (together with a BD Drive cover and woobly metal sheet) from power supply to internal metal parts and among them, also circuit board of Blueray Disc Drive. Forgetting to put it back in, can be the cause of Drive not ejecting or not taking disc’s anymore, but I doubt it would make console dead like not turning on, UNLESS someone forgot also/(or just - in meaning - only) that metal sheet that sits on top of Power Supply Unit and PSU long screws wouldn’t have enough connection with motherboard cover plate (dirt, rust) - that would likely cause console acting strangely. In extreme cases not turning on or powering down after few seconds.