I was hoping to hear from you before spending time on an answer that might not be what you wished to know. But I will assume that you are hoping to be able to hold the police accountable for the damage to your car.
It is difficult but not impossible to recover for property damage from the police. Police have limited immunity from suit or prosecution when they are acting in the course of their duties. So they cannot just be sued for negligence the way you can sue a private individual. They can only be sued when there is a law that specifically says that they can be sued. Those are the civil rights cases.
Where you cannot sue them straight out for negligence, you can sue them for police misconduct. If they abused their authority, neglected to follow appropriate police procedure, for example, if they lied and covered up their wrongful actions that led to the the second theft of your car, for example, this may make out misconduct and allow you to sue. You could certainly sue the towing company, which would not have an immunity issue, if their towing/storing caused the damage.
You would need to sit down with a local civil litigator (trial lawyer) who has experience with suing the police or a local civil rights lawyer. Many lawyers have free or low cost initial consultation fees and you can discuss the matter in depth with a specialist who can tell you how viable your claim would be.
One might even be willing to take the matter up on contingency, which means you only pay filing and incidental expenses but no salary to the lawyer unless/until he wins your action. Then he gets around 40% of your award as his fee.
If this was not what you were asking about, please reply to this question thread and let me know. I'll be happy to expand my answer.