maybe you could back up your save with the ticket unopened, then open the ticket and see what it is and if it is not the car you want or your not satisfied delete that save and copy your old save and try again? I'm sure there might be a better (and faster) way.

I've been reading about the ticket and I heard that it could give you totally useless crap cars. one guy on gamefaqs got a Mazda Miata with that ticket :wtf:

EDIT: btw I don't think quitting after seeing the car will work because it autosaves as soon as you open the ticket. I'm not sure but you can try it. I'd back up the save before you try it.

quitting with the PS button after seeing the car does work to get trophies like high roller, sky high roller, old timer and maximum mileage that's how I got those trophies.