The 404 (Not Found) status code indicates that the origin server did not find a current representation for the target resource or is not willing to disclose that one exists.
Should read RFC updates at breakfast. Settles it: 404 is okey. Also “current representation” 
It’s added at some point.
the explicit acknowledgment that a server might intentionally hide the existence of a resource by returning a 404 status code was first documented in RFC 7231.
2014 it issss. Guess it is not known to many. Look at this thread and even my eating RFC’s for breakfast colleague missed it.