no estoy seguro, pero creo q es después de lv 30 - 40, lo otro es que si estas en un server nuevo, creo q las cajas no podrás comprarlas aun...

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Acá te dejo las reglas q salen que salen en NA, las coloco tal cual salen alla.... según esto con level 30 ya puedes participar y a la vez comprar en tienda... Como mencione antes, creo que no te deja por ser un server nuevo...

Requirements: Players must reach Level 30 in order to participate.

How to：

a) Players participate in daily practice and gain active points, players can get a Fireworks Random Pack for every 20 active points and a max of 5 packs players can get every day(Sent to your Backpack).

b) Further Fireworks can be purchased during the week at the Purchase Limit Shop.

c) There are five different Fireworks from which you can get different contribution points from. Players can claim the individual and group rewards as their acc(um)ulated points reach a different level.

d) The rewards for group members can only be claimed once, contribution points will not be added to the new group if players quit their original group.

e) Members of the top three organizations which contribute the points will receive an additional bonus package.