What is Ted Cruz’s naturalization number?
What is the naturalization numbers of children naturalized when their parents become citizens? They don't have any. They are regarded as "derivative naturalization."
They don't have to take tests, they don't have to swear oaths, and they don't get naturalization numbers. Their naturalization is "derived" from that of their parents.
No Numbers.
Therefore, the absence of a naturalization number is not proof that someone was not naturalized.