When Feng Zhiwei had visited the Dama the previous night, she had quietly swapped the Dama's Dharma Vessel while she adjusted the light of the oil lamp. Inside the counterfeit vessel, she had placed a fragrant powder that Zong Cong had made to smell like walnuts, the aroma of Gu Zhixiao's beloved Gu Nanyi.
Feng Zhiwei had hatched the plan after noticing how reliant Gu Zhixiao was on Gu Nanyi, though even this was just a backup in case Gu Nanyi was unable to attend this important event. The little girl had a surprisingly sensitive nose and had always been especially attentive to Gu Nanyi's smells, and so she easily smelled the walnut fragrance as soon as the Dharma Vessel appeared.
While the ceremonial Dharma Vessel typically carried by a boy Lama could be easily tampered with, the Buddha Beads were by the Dama's side day and night and could not be easily reached.