The cans turned out to be a treasure trove, containing unused shots from the infamous Rebel squadron call sign scene ahead of the Death Star assault.
The visual effects team were able to use these clips in the film’s very own X-Wing attack scene near its climax.
Rogue One has a number of tricks up its sleeve when it comes to paying homage to the original Star Wars films that follow it in the timeline, but this one you might have missed.