How to unpack boxes
Unpacking boxes is very easy (once you know how it works) 
Here are the steps:
1) find the Item in your “Objects” Folder in your Inventory
2) select the Item, and drag it to the floor near where you are standing
This will rez the object so you can work with it
We are going to open the rezzed item:
Right Click on the item. A menu box will open on your screen and Arrows will appear on the Item.
In this menu box (called Edit Mode) there are many options. At the bottom right corner, there is a button that says “More >>” on it Click on that button, and more options will appear.
After clicking on the “More >>” Button in those options there is Tabs.
General.. Object.. Content.. Texture
Click on the Content tab…. after doing this, the list of Objects Inside the item will appear (ie: Clothing)
You can now drag the items into your Inventory (just like you do in Windows, drag and drop with your mouse). You can also create a new folder in my inventory by right clicking on the Clothing Folder, and Create New Folder
then find the “New Folder” Right Click and Rename it the Name of the outfit
But this is your own choice.
Another way to get your stuff out of a box is this:
1. Rezz the item on to the ground/floor.
2. click with your mouse on the item so you can see the arrows (you are in edit mode)
3. use right mouse button to get a pie menu
4. select ‘ Open’
5. select ‘ Copy to inventory’ to get your stuff into your inventory!