The old woman being impatient with her husband opens the box despite his pleas and when the 'delivery man' shows up she then starts to demand more and more extravagant items. She wasn't even pleased with stuff from English royalty because they were 'second hand'. I mean this woman was a greedy …[type].
In the end the 'delivery man' was fed up with waiting and takes back all the stuff he gave only to find out the box was opened. Then when the woman tries to kill him, he turns around saying he remembered it was a pickup rather than a delivery mix-up and takes her soul … deservedly.
The husband wishing to create something useful, creates an anti-tampering device into the box which would destroy it if opened, also much to the pleasure of the 'delivery man'. The widow that the husband's wife hates comes over and the two seemingly hit it off and enjoy each other's company.
So I must say that this by far is one of the best episodes where the truly wicked got what they deserved and the nice meek type person got a nice happy end. Not many episodes has things like this as well as an interesting plot line.