kasowy Anglais:

at the box office (collect your tickets at the box office)

at the box office

I bought five tickets for the play at the box office in the entrance to the theatre.

You have to buy a ticket in box office

The film Avatar broke several box office records.

Endgame has passed the $2.788 billion global gross of Avatar to become the biggest-grossing movie of all time in raw worldwide grosses.