It would seem likely that they should have a record of it.
Since NCMEC is a non-investigatory agency, we don't take further steps to investigate that relationship about what they are saying they did or didn't do when somebody reported to them about CSAM material or asked them to take something down. We do engage and provide reports of apparent CSAM material directly to law enforcement, as a clearing house. That occurs at the national centre at NCMEC on a daily, regular basis.