Okay, people I was just trying to answer the OP's statement about what a "registered" gun is. It was not my intention to either acknowledge or deny the potential theoretical existence of a super double-secret illegal government database that may or may not exist, but go on acting like that's what I was talking about.
FWIW, if such a database does exist, it's not really a registry, or at least it's not complete because there is an unknown number of guns that have changed hands without the "registry" being updated, not to mention how many 4473's are still in the hands of dealers. So if you bought it in Oklahoma from a dealer or otherwise, it's still not "registered". But again, that was not my point in the first place.
Maybe it is MORE detrimental for gun owners to be posting pictures of their firearms on public forums?
That is something that is absolutely NO PROBLEM for the alphabet agencies to check out and record.