Final answer:
The four trunks were special to the Jiang family because they held significance in the burial rituals and beliefs of the family during the Period of Division in ancient China.
Step-by-step explanation:
The four trunks were special to the Jiang family because they were excavated from tombs in the Jiangnan area during the Period of Division in ancient China. These trunks were unique and had various decorations including supernatural animals like dragons, the qilin, and others, as well as natural animals like dogs, sheep, monkeys, and birds. The presence of these trunks in the tombs suggests that they held special significance in the burial rituals and beliefs of the Jiang family.