The thieves appeared to have detailed information about both the cargo and operations at Brussels Airport, said aviation security specialists, and likely had help from people at the airport.
The coffee supply chain example above illustrates the multiple touch points within the supply chain, and each touch point contains important information about the integrity of the cargo being shipped.
Based on information provided thus far in the media and a review of the video, a shift in the cargo load seems a likely cause of the accident in my opinion.