I've also compiled a list of all numbers that have never occurred, count of each occurrence and a lot more. My anomaly analytics have included everything, as an ignoramous, I can throw at it; chi squared; isolated forest; time series; and a lot of stuff I don't properly understand. Most anomalies found have been, if narrowly, within expected randomness, but I intend to fortify my proddings eventually. Although I'm actually confident I'm barking up the wrong tree, the data obfuscation is objectively dubious, for whatever the reason.