I thought this might be a problem..
The loot scripts generate loot on the fly, that is why you can find so many different items with odd combinations (over 55,000 items). While this is really cool for loot finding and trading, it is impossible for me to set the container type since the items don't actually exist in the toolset!
I may just have to remove the scroll case since i cant think of any way to make the scrolls choose that container type..