If you are looking up a particular court case at the courthouse you will need at least the 'name' of the case (referred to as "the style') - and hopefully the date(s) the case was heard.
That would not be a matter of public information, and would only be made available to those with a need to know.
A foreign national with permanent residence status is usually faced with the loss...
Legal for what, exactly? To just be a firearms case, there are no requirements. If you're using it for transporting a firearm by air, it must be TSA approved.