Tsa confiscate stuff, when they are not sure what it is used for. Especially elongate metallic objects. I bet they took the end with the switch?
I would be tremendously fluffed off if that happened to me. The fact that you are not there to defend your cause makes it even worse.
On the other hand i would never allow my SB to fly in suitcase. Bring it on your carry on, so they can ask you silly questions when you check it through the xray machine.
Also, the silly, uncreative, insignificant questions they will ask you the first time you go through TSA checkpoints are important, so next time you go through TSA with your SB you are well prepared for their interrogations.
In their mind, an e cig looks like a real cigarette, long and thin...they are mentally unprepared when you pull out a large diametered shiny metal object out of your carry on that looks similar to a vibrator, rather than an e cig.