I came across an uber-dodgy listing for a KO Soundwave with Buzzsaw box, but packaged with a white (or it might be transparent... only shown in cassette mode packaged) Slugfest.

It ain't fooling many people with that.... but it might mean more cassettes coming to market. Most people buy the genuine Has/Tak reissues of Soundwave rather than looseys, but if you want a genuine slugfest better acquire him quick.
I'd display the image but I'm on an iPad at the moment and don't want to read html