if you mean the box costume its the dance click actions then dance or press d
You cannot get the boxes if you aren't a member. They are hidden in Club Penguin. I can't tell you keep looking.
It means that Puffle party is coming on Club Penguin!
To get the box in club penguin you have to complete the hut and for that u have to be a member
Probally to make the game harder.
there are boxes all over Clubpenguin for a puffle party
Probablys for the Aprils fools party
code
For the special puffle party coming soon :)
you find it at the dance club
The Hidden Lake
key
To get the magical boxes on clubpenguin you must find them in the dojo and accept the offer