While there has been a lot of speculation, no one really knows about the Model 3 fob for sure. It is not for sale yet.
So, when you ask reps about something that in their world, they haven't been told about from management, they don't know about it. You may have even been talking to the person that designed it, but until it becomes official, they don't know about it. That's pretty much the way that most organizations work. Remember that most of the people that you talk to can't afford the cars that they sell. They might have never been in one. And with Tesla's expansion, they may have only been working there for a day.
And especially with a Service Center, they are working their butts off right now, trying to push cars. I doubt if many of them even remember their own names right now.
As I walked into Best Buy one day and was continuously harassed with "Can I help you" my anger got a manager to come over. Their question was "How do you know if our associates don't know more than you" My response? "They are working at Best Buy" and I just walked away. Really hated to be rude, but got pushed into it.
Of course there's a lot about the car that you know than they do.