Ok, cheers anyway.
Some of the stations are do have them, but aren't used by Metro for anything. Includes the former BR stations that were converted for the Sunderland Extension (e.g. East Boldon - 7764). This is mainly due to the fact that to help with the switchover, you could buy a ticket from a mainline station such as Hartlepool to East Boldon/Seaburn/Brockley Whins which included the Metro ticket as well.