Get box content

I am new in plugin developpement (not in C#) and I wanna know how can I get the content of a box ?

Thank you.

 

Look at my MoegicBox plugin, I do quite a bit of box and player inventory shuffling in there.

 

Thx but I don't understand the whole code so it's hard to learn something about that.
Can you just explain me the way I must take for manage content of boxes ?