Hehe - yes, you're right I think I would have noticed. My ticket simply states "Between Hassocks * & London Terminals". (Not sure what the * means!).#
So I guess the answer to the OP's question is 'no'.
The entitlement wouldn't be automatic, so that doesn't imply they don't exist on its own. Where there is an AAA option, it usually costs very slightly more. I had a quick check using National Rail's season ticket planner but nothing showed up for Uckfield or Hassocks.
For an example local to me that is still available, you can get a Southamton Airport to London season AAA at Hedge End, and vice versa. These are shown in the National Rail season ticket calculator.
Back when there was an online NFM I expect we'd have been able to quote a list, but I expect you'll need access to 'the manual' or Advantix nowadays.