Based on the cited NCEES whitelist quote, the relevant evidence is the named calculator family or model. The Casio fx-991CW is matched to the Casio fx-991 family using the stored calculator model data. This evidence note does not treat every scientific calculator as allowed; it only explains why this exact printed model name fits the whitelist language currently recorded for the FE exam.
“Casio: All fx-115 and fx-991 models. Any Casio calculator must contain fx-115 or fx-991 in its model name.”