How does betraying Boxer benefit Napoleon?

The last
paragraph ofreports,

On the day appointed for the banquet,
a grocer's van drove up from Willingdon and delivered a large wooden crate at the farmhouse.
That night there was the sound of uproarious singing, which was followed by what sounded like a
violent quarrel and ended at about eleven with a tremendous crash of glass.

I think this wooden crate arrives as obviously a bunch of booze.
The money made fromturned into 's new hobby: drinking. The evidence lies in the actions listed
in the quote above.