Just found it.

       Some time ago my Keyboard died.  When I went to replace it most were both, paired with a mouse and Cordless.  
       The maybe-not-a-dongle "A dongle is a small piece of computer hardware that connects to a port on another device to provide it with additional functionality, or enable a pass-through to such a device that adds functionality." was taped inside the lid; I wonder why it wasn';t in the Dongle sized hole I found when I opened it, on a whim this a.m.?  It's boud to be safer in there I'd have thought?