How do we verify the bank's true ownership of the commodity (such as a car) in a Murabaha contract, and ensure it is not a fictitious ownership?

The actual possession of all types of goods is a condition for their permissible sale according to the majority of scholars. The manner of possession varies depending on the item. Therefore, the possession of a car occurs by taking possession of it and moving it from its place of sale, such that it comes under the bank's guarantee. If this happens, then it becomes permissible for the bank to sell it.