I didn't know where they were. Do you know?
Really? No, not me. You know now, right?
I still don't know.
It is OK to not know where something or someone is located. That's why you should use Google Maps to find the location.
I use to google maps where I parked my car.
You have the right idea now. If you want to know everything then there you go. I use the internet all the time for that stuff.