Did anyone else get a defective Gemalto key fob for Amazon AWS?

I ordered a multi-factor authentication key fob for Amazon AWS from their recommended vendor, Gemalto. When I tried to register it, it didn't work. I emailed Amazon and they said there was a defective batch and they are sending me a new one.

The device works, in that pressing the button shows a number that changes periodically. I'm wondering what the screw-up was. Does anyone know? Should I trust the new device when I receive it?