Remove the mid bass driver with unscrewing the screws holding it
Be careful to hold it with other hand as cable connecting to crossover is generally kept short and so you don't snap the cable from either end
Then flip the speaker and I think the toy car should be small enough to come out of the cabinet
Second this method suggested by rikhav. Alternately you could open the binding post plate which is fixed using 4 screws taking a similar care about cables connected to the speakers inside.