I have no idea what you're talking about. Guess that makes me old as dirt.
I never had one of the whistles, but it's famous in this context:
no sanitize
https://medium.com/everything-80s/how-capn-crunch-cereal-led-to-apple-computers-c1ee218fef18
Captain Crunch actually did time in federal prison for defrauding the phone company. Jobs and Wozniak got pulled over once with a blue box on the seat of their car and would have been in prison as well if the cop had known what it was.
@AlphaCentauri
It's not illegal to manufacture, transport, or posses the device. It was only illegal to use it.