Where does Cisco IOS/IOS-EX store the SNMP v3 user information?

I can configure "snmp-server user TESTUSER TESTGROUP v3 auth sha PASSWORD1 priv aes 128 PASSWORD2". But this user information, such as username, auth and encryption, does not show in running OR startup configuration.

But if I do "show snmp user", the information shows up… IOS-XE 3.6.10.