Unworked shells were limited to only a few graves. The majority were discovered at the central grave (Grave 14). A few were found in looted graves in the pyramid (Graves 12 and 13), and others were found at the front and back sides of the pyramid. Several spiral and conch shells of different sizes also had been found at the top of the Feathered Serpent Pyramid (Marquina 1922) and in front of its stairway (Pérez 1939; Rubín de la Borbolla 1947). Sixty-six complete or semicomplete unworked shells were discovered as general offerings in the central and southwestern parts of Grave 14 (Photo left). Their direct associations with individuals were not recognized in the field, as they were, together with many other kinds of offerings, found on and between the bodies. However, the spatial distribution of shells by species indicates that the offerings were intentionally located by type to a certain degree.

Unworked shells (Photo right) were taxonomically identified by Clara Paz based on sample identification by INAH Biologist Oscar Polaco. Within the family Gastropodea (univalve shells), Genus Oliva and Turbinella were identified. In the family Pelecypodea (bivalve shells), Argopecten, Genus Ostrea , Pecten , Pinctada , and Spondylus, were identified. They had been brought from both the Pacific and Atlantic oceans.