Min fru och jag undrade också detta. Enligt detta Sydney Morning Herald article var det annorlunda varje gång de sköt scenen, och publiken är inte tänkt att se den.
Roberts opens the box, but it's filmed in such a way that the audience can't see what's inside. [...] "There were different things each time she opened it," Wilson says. "What got the biggest reaction had to do with a reference to something the director said at the lunch. That really got her."