The fact that these people are wearing government mandated masks probably makes facial recognition software ineffective.
You can still make them out with newer software.
On top of that they have thousands Cameras. To track the vehicles they came in (even if they left their masks on the entire time while traveling which I highly doubt), the credit cards if any they used to eat.
Since about 2002 (right after 911) and the Patriot Act. Everything went on steroids. It was being built in the 1980s and 1990s. Check out William (Bill) Binney has to say about it. He was the top technical guy in the NSA that built it and spoke out against how it was being used. They can even take your smart phones in an area and start to track you.
Every airport, bus terminal, train station have facial recognition now.
I think this is Wray trying to keep President Trump off his back and trying to look like he is doing something. Wray is probably feeling a lot of heat right now from President Trump. I think they are betting on President Trump does not know they could easily find these people.
They know who they are and where they are, what the hell are you waiting for