Okay I've had three contests so far and they have all been the casino ones. Is it a bug, terrible RNG, or they haven't added any others yet?
Does the box reward depend on your rank? I just got a white robot that's worth nothing, I'd gladly pay a million for a legendary. Btw how many points did you get? In my current contest #1 is 278K, and there's still an entire day to go.