Say he asks the girl what happened and her reply is "Oops my bad, simple mistake". How is he to know that's true? Might solve his immediate problem of a mistaken OK yet someone COULD still be out there up to whatever. Gina however can look and see if there is a pattern, where the OP can't. If it's a mistake that will be the end of it, but she's the only one that can actually know that.
Most of the time being nice and worrying about being polite is great but in this case the only reason we use P411 is for security, and security by it's nature isn't polite or understanding or trusting.
As for OP being OK'd by someone he has seen, I would hope he wasn't dumb enough to post this thread without considering that.
You're trying to be nice and trusting but if there was trust all around we wouldn't need P411
I'm not some mean guy by suggesting that he deal with it with security in mind first and foremost. It's not about fairness or respect, that's just how security works.
No one said she was working around the rules intentionally, but giving an OK to someone you haven't seen is against the rules regardless. If it's an innocent mistake then that will be the end of it and if there's something fishy going on we're all better off by it being uncovered.