Okay, first off: Stealing? No. It tore through the poor choice of
container. Postage due? When the DPS rejected the item, it became a
"chunky." Size and weight were calculated as a parcel, and rather than
returning it to sender, collection of the remainder of postage due would
have been attempted on delivery; however since the contents escaped, they
cancelled collection, hence the blank line, so disregard it. Look at the
bright side. You got a free stamp since it wasn't cancelled.