It was likely dismissed because the officer erred in issuing a citation for VC 16028(a) without also issuing you a cite for an underlying offense. Don't red too much into that dismissal.The citation was dismissed in the interest of justice- The officers audio recording was very enlightening. I got the recording during Discovery, Yes, I am filing in federal court myself. I would rather try and fail then not try at all.
Did you request a post-storage hearing? You say you inquired, but that you were referred back to the citing/impounding officer. While the agency should have probably referred you to the correct process by which you should request a hearing, they will likely respond that you never asked for the hearing so you lost out on an opportunity to challenge the validity of the impound through that course of action.
I'm curious, what are you citing as grounds for a 1983 action?