Those older voices are stored in the keyboard, but they in another category. Just press the button next to the voice you wish to find, and the keyboard will automatically take you to that storage area. Unfortunately, my keyboard is loaded in my van for a job right now, or I could provide you with more detailed in formation as to their exact location. I believe they are in a folder called Legacy Voices.
Gary

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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)