They don't need the actdual weapons for that. There are videos of them brandishing them everywhere. In fact, they suspects are doing interviews. The warrant was a political stunt, nothing more.
Maybe just interested in avoiding a shoot out if they end up indicted.
Also the lady said her gun wasn't even operable. Maybe they just want to have the guns as evidence.
1. You can’t issue a warrant for that. He’s got 2nd amend rights.
2. As I said, this was utterly unnecessary Beyond currying favor w her voting base.