Box 25 (Spanish: Caja 25) is a 2015 Panamanian documentary film directed by Mercedes Arias and Delfina Vidal. The film is about letters that were written by the men who built the Panama Canal.
It was originally reported to be the Panamanian entry for the Best Foreign Language Film at the 88th Academy Awards. However, when the final list was announced by the Academy, the film was not included.
The film opens with a map of the area showing Timors in relation to the north Australian coast, and briefly explains the circumstances of the left behind Australian troops who did not surrender but carried on a guerrilla war against the Japanese. After some very difficult forays behind enemy lines to capture equipment for radio, they manage to contact Darwin. Wary of a possible Japanese trick they ask the men what the first name of a wife of a particular sergeant was. When the correct answer, Joan, is returned, the Australian military starts to airlift supplies to the guerrillas and their Timorese allies.