Worth noting, if you also removed modules/users during the transition to 100c AND you are on a version of 100 which supports self-updating keys then you may automatically have your keys updated and the modules/users removed.
This happened to me with one customer where they dropped users and modules and were on a version of Sage supporting auto-update keys.
Versions of Sage 100 and Sage 100c which auto-update keys:
2015.5+
2016.2+
2017.0+
Note: Versions 5.20.3 (2015.3), 5.20.4 (2015.4), 5.30.1 (2016.1) will have the ability to update the payroll expiration date with the Update button by installing the Hot Fixes based on version KB 83158 (
https://goo.gl/NnlQbY ).