Ill probly send more

So how does this work. Do we just send our box to the person below us in the list, like we do on the runes reading list.
Or is it a group that just passes the boxes on the next person, over and over till we get our original package back and you just take out what you want then continue to pass? That would be like a trip to the post office like what, once a week? Which would work ok for me.