Confiscation of cars (Need for Speed: Most Wanted (2005))

After car is confiscated, I knew to buy it will be possible after the passage bet the boss, or when you defeat the next member of the blacklist (not fully understand this system). At any place in the black list it can be done? I am now in second place (pass race Razor), and that should be allowed to confiscate the car. And in fact if you can't get back that slot in the garage is wasted, and not to return and not remove it absolutely. I have one token of the return of the cars from the car pound, but I don't want to spend, and then going to another dossier to pass.