An inventory of unpaid items where more than one was present would
show
|> bag's contents N zorkmids
if any of the items were inside a container whose contents aren't
known. But if there was only one item (so container must be owned
by hero) the 'Iu' output menu was skipped for pline and yielded
|> scroll of magic mapping 133 zorkmids
Force the menu display if the lone unpaid item is inside a container
whose contents are unknown.
I'm not sure whether a hero-owned container can have both unknown
contents and an unpaid item in normal play. I managed it while
trying to fix a reported problem--except I can no longer find the
relevant report--where itemized shop billing also revealed unseen
container contents (for any number of items, not just 1). That isn't
fixed yet, but I want to get the simpler 'Iu' part out of the way.