Picked this up from Goodwill site, it's probably not quite NOS but nearly so, the Car cord has never been unwound but the wall wart has, the warranty card is still with it and not filled out, it works and the set itself is perfect and pristine, no marks, corrosion or even fingerprints. It's missing the instructions and the top Styrofoam packing.

Nice score !

I used to have a similar set by Pantysonic in the 70's.