I've completely forgotten what the advertisement was for but there was a guy riding a bicycle with a JC2000 on his shoulder, I hoped so hard that they trained the actor not to drop it!! I think the premise of the ad was about noise pollution and how (whatever the ad was for) quiet your life could be with it. 

I'm pretty sure this is not a jc2000 , more like a Elta or Super Jumbo

Oh, cool to know. I'm hoping to see it again but these ads are usually short-lived.

I'll keep an eye on your boombox listings on Ebay