GamuT M230 Mono Amps - Anyone have a pair?

GamuT supposedly made only a handful of this model.  I bought them new several years ago.  To my dismay, GamuT labeled them with M200 labels.   Because I'm considering selling them,  I recently contacted GamuT to request confirmation by serial number that these are in fact M230 models.  The response was that they don't keep track of serial numbers.  Really?  For a unique run of amps that retailed at $16,000?  I do have the original receipt but that doesn't prove anything if GamuT won't back it up.

If you have a pair of these or know somebody who does, I'd sure like to know if they were all labeled M200.  I had the top off M200s and compared to the M230s.  Not the same hardware not to mention that the M230s have markedly better performance.  Thanks for any suggestions or connections.