I wouldn't call it unique. It's a small reward for everyone doing dailies. You can claim it and it won't hamper anyone else. They too can get the same rewards you do, depending on how long they decide to wait to claim said rewards.

The more dailies your group performs in number, the more boxes that can be unlocked. So, if someone wanted to wait until Sunday - which is when group boxes refresh, they could claim everything there. Most people just do it daily as it pops up.