It’s probably something nice and one of the pigs wants it.
A few years ago my son accidently shot himself in the shoulder while loading my Sig229 while target shooting. The cops told me they had to take the gun for some reason and I could get it back in a couple weeks. A couple weeks went by and I never heard a thing about my $600 dollar gun. I went down to the police station (about 3 times) and was given a bullshit story each time. Finally I got loud and nasty and demanded it back and they gave it to me. I do think they would have kept it otherwise, and this is just a little one horse town of 3000 people.