That's WAD, those are indeed stored directly in the device without CUCM being involved, if you want them to show in CUCM, you need to configure them in UCMuser or CCMadmin pages.
I never tested with a KEM, but on a 88xx if I logged with EM and the buttons were used in the EM profile (after being configured directly on the device), they would be gone when I logged out. Or if I manually configured those buttons for something else, they would also be gone without any notification (As CUCM is completely unaware of this)
HTH
java
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