As it turns out, this box is what is scanned by TSA before going in to security and the flight crew at boarding time. I just handed them my device and it went under a scanner and as soon as the information was read I was on my way.
Of course the first time I used it at LGA I was sure it wasn't going to work. I went to the check-in counter first just to make sure all I needed to do was show TSA my Blackberry. They said it should work but they printed me a boarding pass just in case there was a problem. They were pretty funny - they said "show them your Blackberry first to see if it works, only pull out the paper boarding pass if they try to send you back to the counter". They wanted to see if the system was working.
I got up to the front the security line where they check your ID and Blackberry - I handed the TSA agent my Blackberry and ID. She didn't even bat an eye. She scanned my device, checked my ID and that was that. When I boarded the plane they held my device under the bar code reader and again no problem.
What a great way to travel, so easy plus it made me feel oh so tech savvy!