There are genuine CDs of these shows out there Rob. How can you be sure they're bootlegs? These concerts were recorded for radio play, pressed onto CDs and distributed to radio stations throughout the USA.
They will have the name of the show, Superstar Concert Series, etc. printed on the disc itself along with the show number & week to be aired. If they haven't I wouldn't even think about buying them. Always make sure you get the cue sheets as well. They come in paper sleeves with the King Biscuit and Westwood One logos printed on them.
The King Biscuit Show was recorded at The Music Hall, Cleveland, Ohio in 1978. The Superstar Concert Series Show was recorded at the Hudson Theatre, New York at the very beginning of Meat's Bat II World Tour in 1993. I believe the Trick Or Treat Show is the same as the Superstar Concert Show, but somebody please correct me if I'm wrong.
Ask the seller for more details if you have any doubts they are genuine.
Hope this helps.
Diane