Four Maya codices survive in the world. Landa records twenty seven books burned at Maní, but the Relación survives only as a shortened copy of a lost original, so his own figure cannot be verified against what he wrote. No census of the pre conquest manuscript corpus was ever made, and Maní was not the only burning. Nobody holds a position on the size of the corpus, which makes this an unfilled gap rather than a scholarly disagreement.
What would resolve this A recovered fuller copy of the Relación would establish what Landa actually claimed. An archaeological find of interred or cached bark paper manuscripts, of the kind that has produced fragmentary codices in Maya burials, would begin to establish the scale of production. Systematic study of codex fragments already excavated but too degraded to read may become possible with improved imaging.
OpenMaya epigraphy and archaeology; colonial Spanish archival history; conservation imagingDiego de Landa, Relacion de las cosas de Yucatan