Team boxes (1 to 5 depending on your Team League) can each be opened once a week.
To open a team box, the team must consist of at least 5 people.
If the team has less than 10 players, all players in the team must provide the minimum contribution required for that box. For example, if the requirement of the 1st team box is -individually- 2250, all players who contribute to the box have to reach this goal.
If the team has more than 10 players, this requirement doesn't have to be met. All members of the team that made contribution can get the rewards when 70% of the goal is reached.
The reward of a box can only be received once in a week. For example, if you received the 1st team box reward in a team, you cannot get the 1st box reward again within a week when you switch to a different team. If you make the necessary contribution, you can get the other box rewards.