99% of the time though, you'll just win the same paint job for a car you don't own, or maybe a nifty steering wheel cover you can't see in game maybe if you're really, really lucky, you'll win some cool spinning rims....again...that only works for a car you don't own that can only be won from a different kind of lootbox available only during special events...

Also, all these things are one day trials...that have to be used within 7 days or they expire.