If you Stored the Rigs while the Cab was locked, you replaced the other Cabs with the Locked Cab,
With the Cab section in view, you can Browse the Factory Preset Rigs in your KPA, or change the view to Cabs from other Rigs.
You can Copy a Cab from a Rig, and Paste it into another Rig.
Also, KEMPER Factory Content 6.0 for Upgraders (May 2019) contains 18 Celestion Cabinets.
If you want to use the original Cabs from the Rigs, you will need to copy the Rigs into the KPA to be able to Copy the Cabs into your edited Rigs.