Is it permissible or forbidden to buy a car whose sale contract with a previous buyer was rescinded, and what if it becomes clear that the rescission was without just cause, knowing that the car has been owned for four years?

The earnest money sale is when the buyer pays a portion of the price. If the sale is completed, it is counted as part of the price; if not, the amount paid belongs to the seller.

There is no specific legal duration for an earnest money sale; rather, it is subject to what the contracting parties agree upon.

If the company terminated its contract with the earnest money owner, there is no harm in you buying the car from them.

The principle is that what is in a Muslim's possession is his property unless proven otherwise, and what is unknown is as if it does not exist.