Teardown of Two Russian Missile Sensors (@lelabodemichel5162)

He looks at 20 year old stuff, doesnt dump the firmware and there are obviously no explosives involved. You can find this stuff in museums and on ebay.

edit: The topic even made it into mainstream television https://www.youtube.com/watch?v=R5TW6E3Aonw

Here the heat seeker / guidance system of a Sidewinder in a Pawnstars episode. She got 500$ in case someone is wondering. Her father got it from military surplus crates.

edit1: Sidewinders are still in active use btw. And according to wikipedia might be through the late 21st century. Stuff is just getting old, this is not much different from Magnetrons being shipped in household microwaves. High tech just gets old.