Left join?

we are trying to pull all locations from the PA1 that have containers, so this query seems to work, problem is that there are locations that DON't have a container, so we need to pull those also.  Why will the below not work. PLease help we need this asap.





select i.whse,i.loc,ct.container_num, i.item,it.description, case when c.qty_contained is null then qty_on_hand else c.qty_contained end as qty
from  itemloc_mst i
      inner join item_mst it on it.item = i.item
      left outer join container_item_mst c on c.item = i.item
      left outer join container_Mst ct on ct.container_num = c.container_num and ct.whse = i.whse
where i.qty_on_hand > 0
and i.whse ='pa1' and ct.whse = 'pa1'
and i.loc like '20I01%'
and c.item is null
order by i.loc desc