(From the sound of it, looks like I did pretty good...)
Just got my first 1,000 Ticket a few days ago.
As I had nearly 900 cars at the time (now up to 912), I was fully prepared to repeatedly retry opening the ticket to make sure I didn't get some untradeable duplicate or a prize car I haven't won yet.
Thankfully, right on the first shot, I got a sweet ride that I didn't have and wasn't buying because it's a prize car - the Ferrari F430 '06!
(Hopefully, by the time the next ticket comes along I'll have all the cars I can have in the game, so it'll just be a question whether I actually want multiple copies of the car or not...)
Peace...