How to get vehicle from police custody without registration papers

Hello sir/ma’am We had a car accident the next day we purchased the car. We had purchased the car on 14th july 2018 and met an accident on 15th july 2018. In the accident few seized cars by police were damaged and an FIR was lodged against us. The police said we need to get the car from the court. But unfortunately the car met an accident the next day after the purchase, we had paid the insurance fees, all the taxes and registration fees amount but have not yet received the registration copy yet because the car was damaged before the physical verification of the car. I want to know the process through which we can receive our car back with the payment receipt of the registration. We do not have our registration copy, but have paid all the dues and taxes, Kindly help