When I go to BB/drums folder, only the following txt file appears:

If this folder is empty, either you haven't installed any RealDrums, or you are using a Drums folder location outside of the bb folder (i.e. different from the default Drums folder location).

If you are using a different location for your RealDrums files, you need to specify it in the RealDrums Preferences dialog in Band-in-a-Box.

If I do a search for "RealDrums" on my system, nothing shows up.

I won't be concerned about now since I have plenty to keep me busy.