I didn't really get your question, ha. No, the level 40 gift boxes are a sprint for 3 days, which people who don't want to spend Cash Shop recharging buy in-game off other players.
If you need the money, take the money. Once you start using a sprint, you feel really slow after and want to buy more ~ I can't play without a sprint anymore, it's terrible ha.
But if you need the funding, sell it. It's worth about 10m, I saw them vending for 12-16m a few days ago but weren't selling, which is why I said 10m would probably have better luck.
But yeah, I couldn't tell if this is your first mmo and you were confused about how it works or what, ha.
http://wiki.ggftw.com/trickster/Leve...ward_Box_Guide All the level up box rewards, also free free to use the TO
Price Check forum if you're curious about pricing.