If it were me I'd be thankful that I didn't have to spend the night in jail & thankful that I got my firearms back. Your rights would be violated if they had stopped you for no apparent reason and cuffed you & confiscated your guns. Trouble is that you were leaving an area where you had just broken their laws
ET. is giving you sage advise, You were completely in the wrong and still wasn't charged with any of the violations got your guns back and now you are contacting a lawyer because you think your rights have been violated .
Chalk it up as lesson learned be thankful and move on!