Mystery box

Mystery boxes are Nitro Type's daily rewards system. Aside from the cars, only cash can be earned from them. XP and nitros used to be obtainable in mystery boxes, but they have been removed. A mystery box can be collected in the garage every 21 hours.

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Achievements
There is an achievement category with mystery-box related achievements called Cruisin' Back. Below is a list of achievements one can earn from collecting mystery boxes.

Cars
There are three cars that can be earned by opening mystery boxes: two of them are claimed randomly from a mystery box, and one of them is earned as an achievement reward once you open 200 mystery boxes.