Depending on why the guys guns were being removed, Im sure it would make a difference in what happens to them, we had a case in Pittsburgh where a wife alleged abuse, and the police impounded about 70 high end rifles, mostly expensive assault style weapons, including a HK PSG?? , the pre ban sniper version of the HK 91 was what it was, and the guy had to go to court to get an emergency injunction, because LE was going to stamp "evidence" numbers on the guns, and he claimed that it would ruin the value of the guns, he had NOT been convicted of domestic violence at that time.
Egregious destruction of private property is just that, unless they are legally justified to take the guns and destroy them.
If I were you, I would make a complaint to your local "action news" investigative reporter.....