I filed a FOIA request, as the author suggested:

https://www.muckrock.com/foi/united-states-of-america-10/tsa...

Given that involves a lot of personal information, I also asked for more general information sans personal details:

https://www.muckrock.com/foi/united-states-of-america-10/sec...

I'd be surprised if either are fulfilled with any actual information.