From the article, "he managed to steal 630,000 files from Boeing's system, totalling some 65 gigabytes of data, from 2010 onwards. A report prepared by the hackers reads that "experts inside China have a high opinion" about the data on the C-17, and that they "were the first ever seen in the country.""

https://news.vice.com/en_us/article/kz9xgn/man-who-sold-f-35...

He got a bit more than the manual there.