I think it was in the mini series but one of the raiders scanned either Apollo or Strabuck, I forget which, but it was masked as that scan is what caused the vipers to shut down on the newer models. Maybe that's not it at all, maybe that raider recognized Apollo/Starbuck for what they he/she was, cyclon.
But, I also think that Bill Adama could be the final Cyclon and that the Razor series was a red herring. Instead of him being the hero of his little memory, he was actually captured and cloned or reprogrammed. If you remember he also has the power to project like the other cyclons (well, in that case, Baltar too).
First off, RDM confirmed in the comments about the Last Supper photo that the Final Cylon is someone NOT at the table, so it CANNOT be Adama. Second, the only time in which you can assume Adama was projecting was in his thoughts about his wife. Those scenes were clearly not intended as projections and were, instead, imaginings of what his wife would tell him if she were still here with him. Basically they were fantasies.