Go to the repo company and get your stuff back.The lender should be able to tell who has your things.
That is not possible to recover money that has been invested into a car that has been repossessed. Usually there is a 10 day grace period to recover personal possessions from within the vehicle. If you want to recover money invested into the auto, try to get the vehicle back from the bank. Good luck!
If a car is repossessed due to the payments not being met then there is a period of time where the repayments can be sorted, or if not the car will be sold to recover as much money as possible. Any outstanding debts will still need to be honored and finance companies often have power to sell your home to recover the debt. It is possible to get good insurance to cover this scenario.