Do the people of umuofia know what is behind the egwugwu masks or not?

In "Things Fall Apart" by Chinua Achebe, only a select few individuals in the community know the identities of the men behind the Egwugwu masks. This secrecy is maintained to preserve the mystique and power of the egwugwu, who serve as the embodiment of ancestral spirits and dispensers of justice.