private string box = "assets/prefabs/deployable/large wood storage/box.wooden.large.prefab";

How do I go about changing that for a coffin so I can load more skins in?

I second this!

I did it already. 

Change in skins.cs :  private string box = "assets/prefabs/misc/halloween/coffin/coffinstorage.prefab";

Your a legend!

Merged post

Now how do we go bigger haha. Is there any way to link it to a Backpack? Or have a scroll option in the box?

Now your asking questions out of my league .... lol