The person who sold it to me had hesitated to tell me that it was very rare that it was a prototype (he finally sold me all his pcb stock including this kit)
Personally I doubt it
What snk made in a small series
Seems to me more reasonable
I saw one once in kit like the one for sale on yahoo
And a 10 times just the link pcb with wiring and slot for sale on yahoo
There is a big box that contains the other box