I would think that atleast this one gun in the case from yesterday would not be given back as evidence in the case. I hope that LE is still holding the assualt rifle that was in question.
From the Chicago Tribune article: "Drew Peterson, 54, was arrested and charged with a felony weapons violation Wednesday after one of 11 firearms seized by police during the execution of a search warrant in November was found to be nearly 5 inches shorter than required by law, officials said. That gun will remain in possession of state police."
I would think that the other two guns seized were the ones that belonged to the Bolingbrook Police Department. Those have already been returned to the Police.