It would seem DM didn’t have the right information anyway if WM in fact gave them to the police? It’s interesting that DM would even drop someone’s name if Wayne did in fact give guns away? Are gun owners allowed to do that?
It seems like there were lots of guns over the years, so maybe WM did at some point give some away to the person DM mentioned and then give the rest to the police during the amnesty. The two aren't mutually exclusive, IMO.