There's one vendor "Roldolfo Alonso" who has quite a few
engines advertised as "new" and he shows photos of what
are supposed to be crated engines. 

Hi Dale,

FWIW, I'm buying his single rotor, which isn't really in the same batch as the Renesis engines, since he said he got this with the idea of using it in a jet ski.  So far, the guy has been very easy to work with, and even volunteered to let me send half the money, then the other half when I actually got the engine.  I'm certainly willing to chance the no history part for a tenth of the price of the Renesis engines.

If you read the Q&A, it sounds like he was working on a project using alternate fuels that has ended.  That would easily explain how he has these engines on hand.  If I wanted a Renesis, I'd be real interested, but at the moment, I don't.