The “Dragon Box” can be purchased from the in-game Item Shop for Silver Lions from February 1st (11:00 GMT) until February 28th (11:00 GMT). It doesn’t require a key and can only be purchased by players who have bought at least one researchable vehicle at Rank II or higher on their account.
When: From January 30th (11:00 GMT).
Where: France > Army > Premium vehicles.
From February 1st until February 29th, you’ll be offered 8 tasks consecutively. Completing each will reward you with a trophy, and completing all of them will earn you a unique player icon.
You can immediately purchase this profile icon for Golden Eagles until March 3rd, 11:30 GMT without completing tasks. To find it, go to your Nickname → Achievements → Pages of History.