It is difficult to trace the range of available divinatory numbers from the statistics of digital hexagrams. Now, however, we have definite proofs about the numerical ranges of Shifa (a new unearthed divination method) and about the Dayan divination method (the orthodox divination method of Zhouyi). As Shifa is closely related to Guicang (Reverting to the Hidden, Yi of Shang dynasty), SEVEN could be the key divinatory number in analyzing the numerical range of Guicang. Therefore, relationships among number groups of different divination methods could be distinct. The annotation “It is divined by the fixity of SEVEN and EIGHT of Yi in Xia and Shang dynasties” implies that Jia Gongyan (a famous confucian of the Tang dynasty) had misused the Dayan divination method. It could be certified by the odd-even analysis of Guicang of Qin Bamboo Slip Manuscripts. This study also reveals that the divinatory numbers of unearthed dice correspond to Shifa rather than the original report.