Actually I do, although I may not have articulated it well. I'm perfectly familiar with the purpose of a corner reflector. In martime settings such as the one in the second image, the purpose of the reflector is to produce a much larger radar signature when swept. For a small civilian craft, that would be likely used to make itself more likely to be noticed by larger ships' radar, so as to help avoid collision.
An example of a use in electronic warfare in a martime setting is similar to deployment of chaff, where you deploy the reflector away from the ship in the hope that the oversized radar signature of the reflector draws away an inbound missile using active radar homing.
I may not know what purpose the (likely) corner reflector in the first image was put to, but looking at the debris, it appears to be the remnants of such a device or something similar.
Or are you saying that the junk in the first image is instead actually the leftovers of a crashed alien craft?
Meh
"That's because the "UFO" debris found actually was the remnant of a crashed device called a "corner reflector" that was being used to detect, at long-range, Soviet nuclear blasts"
One thing about FR, some of the damndest experts show up from time to time here........