Your CAB-2 will say "base not found" if it's not on the same channel as the base, no matter how close it is.
Try cycling the base through the different channels (button on bottom of base), and the remote should find it.
I assumed CAB-1 was a typo since there is no display on a CAB-1. If you really have a CAB-1 that has a base issue, it's much harder to change the channel!
-Dave