Is the extra availability when searching on BA still messed up? I searched for a route yesterday and got the 'extra availability has been made available message' but nothing showing as available in J.

Does getting the message mean seats are available but I just need to call up?
If I don't get the message does that definitely mean no availability or has anyone called up in this scenario and discovered reward seats are available?
Any other indicators I can look for before calling?
I know that the extra availability books into the I bucket so I assume looking on expert flyer for I availability would be an indicator but how much does their need to be in I?

Sorry for all the questions; I am researching a range of travel options at the moment and trying to avoid the need to have to keep calling up and wasting mine and the agents time,