Team boxes (1 to 5 depending on your Team League) can each be opened weekly.
To open a team box, the team must consist of at least five people.
If the team has less than ten 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.
This requirement doesn't have to be met if the team has more than ten players. All team members who made contributions can get the rewards when 70% of the goal is reached.
The reward of a box can only be received once 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. You can get the other box rewards if you make the necessary contribution.