[quote name='LackeyZero']Trade-In implies you're shipping to Noram. If I remember correctly, I did that once. It's certainly safer in a box due to the protection. Otherwise there's no problem.[/QUOTE]
Unless the box is made specifically for the game, assuming one here, then I don't know why you would think it provides protection.
Bubble mailers are the best way to go for about 2 games depending on the mailer size, otherwise, the box is the way to go.