There are the 3 white relays that Yggdrasil already mentioned, and also the 3 red relays on the right side (labeled K100,K200,K300). All of those will have some silver or gold plated silver contacts inside. There are 6 white surface mounted LED’s at the top-right corner which should each contain a single gold bond wire. Those would usually be labeled with a Dxx number for diode, but in this case are labeled for their function showing that voltages are present, so V100, V101, etc. To the left of that black connector there are 2 different types of IC’s, and the other little black device between them that has 3 pins on one side and a metal tab on the other side, is a transistor. You have a few of those transistors spread around the board. Other than that you also have several of those tiny little brown MLCC capacitors (labeled CXX) which you should save because they contain silver and may also contain palladium.