In the second year of Daoguang's reign (1822), Shi Hou [captured] and his kinsman Shi Shubao [at large] were partners in selling cloth, and had hired Shi Gui [captured] as a porter. They went to Guangdong to sell their cloth, and did this for many years.
In the twelfth year of Daoguang’s reign, Shi Hou, Shi Shubao, and Shi Gui went to Guangdong Province to sell cloth. On the way, they ran into a Cantonese acquaintance named Wang Mazhi (aka Fan Zaizhi).
Wang told them that the profit from selling cloth was too slim, and he desired to sell opium to the Shi kinsmen for resale in Fujian. Wang stated that he was familiar with the business practices of foreigners from the “Red-Haired Country,” and could understand the foreign language. If the Shi kinsmen wished to sell opium, Wang could arrange a deal with the foreigners and get a cheap price.
Shi Hou and the others agreed with Wang Mazhi, and travelled with him to Macao where they spent 480 silver taels on 40 bricks of raw opium.
Shi Hou ordered Shi Gui to go back to Fujian and sell the opium. The profits were substantial. After this, the Shi family regularly travelled with Wang to foreign boats near Macao to buy one or two chests of opium, and gave regular (but uncounted) salary to Wang Mazhi and Shi Gui.
Source: Junji chu Hanwen lufu zouzhe (Grand Council Chinese-Language Palace Memorial Copies, often cited as LFZZ), Beijing: First Historical Archives, 03–4007–048, DG 18.10.29.