They mostly use cash for bribes. They found 200 million yuan ($33 million) in cash at an energy official called Wei Pengyuan’s home. They had to use 16 note counting machines to count it, and there were so many notes four of the machines broke under the load.

http://www.bloomberg.com/news/articles/2014-10-31/china-seizes-record-33-million-in-cash-from-official-s-home