I didn't notice who the OP was at first, and as I was reading it, I thought, "Man, somebody should tag Mas and make sure he knows about this."
A few months ago, I was really close to buying an N frame that was advertised as having been tuned by Denny. I spoke to Denny, and he said there was no way he could tell me whether it was true without inspecting the gun, even if I had the serial number. Kinda wishing now that I'd bought it anyway.