What is the Sharia ruling on buying cars from banks that do not own them until after the contract is signed and the sales documents are authenticated, with no possibility of retraction after signing?

It was previously mentioned that there are conditions that must be met in the bank's cars sold by it, including that the bank must have genuinely purchased the car and it must have entered its possession and responsibility. As for selling what the seller does not own, whether it be a bank or otherwise, it is included in the prohibition of the Prophet (peace and blessings be upon him): "Do not sell what you do not possess."