Do this:
(1) read the contents of the PIC to a file on your PC
(2) replace the contents of the PIC with a loader
(3) read the contents of the eeprom to a file on your PC
(4) kick off the editor that matches your read-off fileset.
(5) read the eeprom file using the editor
(6) the keys as such they are will be listed in the editor. There will not necessarily be any PMK (plainmasterkey) at all; perhaps only PKs (plainkeys).
So you will need to know the filetype on the card so you know which editor to use. If you don't, it's a question of trial and error.
Note: if the chips on the card are removable (DIL chips in sockets) then you only need to remove the eeprom and read its contents directly - i.e. no through-PIC loader is needed to get at it.
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