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.