Until recently his true date of death was not officially known.

During its operation, it was officially known as Building 210.

From then on, I was officially known as "the period girl."

I'll tell you something about only a dozen other people officially know.

Maybe they'd known these techniques for years, but now they officially knew that someone else was using them.

"Do you want what I knew officially, or off the record?"

It is not officially known the reason for the current diplomatic situation.

So really, what's the difference if we all officially know that no one cares?

The Tiger program returned a few years later, but the return date not officially known.

Would the Council then have told us, now that they officially know you're working the job?