Hello,
Regarding the ''Mystery Box'' issue, please check whether you get EXP when one game ends.
Regarding the ''Sure Egg'' issue, if the legendary outfit you obtain from Surprise Eggs is not the one you chose, you will gain 1 point for your Sure Meter.
When you have 2 points, the next legendary outfit will be the one you chose in Sure Egg.
You can see the whole intro in "Sure Egg".
In case of persisting issues, please go to our website https://support.partyanimals.com/login, create a ticket with a topic describing the issue, and provide the time you encounter it (including your time zone).
If there's a video or screenshot, please also attach them.
Thanks for your support!
Best,
Party Animals Support Team