fwiw I know a police captain of a local force who told me he never has given back a firearm that was given over in similar circumstances. Told me he just sends them to be destroyed and tells people to sue the department if they complain and has never had any backlash. We have had many conversation about this but he won't budge. I consider him a good guy and we agree on most everything else in life. For him it's just self preservation and not wanting to be the guy who gave the guns back to a person with bad intentions. The ultimate cya I suppose.. I sincerely hope you get yours back and I would follow the advise above, document everything and nag them each and everyday taking names, certified mail etc...
No respect for the constitution or the people he is supposed to serve. My Daddy always said we are judged by the company we keep.