Hmmmm...................let's consider some facts, or what I think are facts.
0) Decades ago, there were no big box stores. It was much harder to get a good guitar, even though guitars are mass produced. A lot of famous musicians used to shop in places like Manny's in NYC. They would walk in off the street and try instruments right off the self just like any of us would do.
1) Decades ago, when guitars were produced without CNC machines and more hand work, there was less consistency among instruments, or so it seems. There are stories of guitarists gifting and passing instruments around to each other. Instruments that were "the one". Even today with all the advances in automation, some instruments just feel right and others feel wrong, out of the same production run.
2) Musicians have always wanted to customize their instruments, not just cosmetically but functionally too, and even their precious ones. Hotter pickups, thinner necks, etc.
3) Decades ago, the mass producers didn't have custom shops.
4) Endorsements...................
Take all these facts together and it's easy to see famous musicians taking their favorite instrument to a lutheir for repair. Then, the musician talking about what he loves and hates about his favorite instrument and the crap the manufacturer sends him through the endorsement deal. Then, the luthier impressing him with how well he can make a crap instrument play, sound, and look. It's not hard to imagine a luthier stripping everything off an instrument provided via endorsement and making the instrument great. In the end, the instrument still has the manufacturer's logo, but could be totally refinished, pickups rewound, magnets changed, neck shaved down. Hell, even the body might be brand new, from the luthiers wood stock. So, even if the luthier didn't produce a totally completely new instrument with a perfectly forged logo, the result is still practically ghosting. The only really difference is that the logo was original.
Even though major manufacturers have custom shops now, if they're busy, then people have to go elsewhere. I saw a
sweetwater interview with Bill Kelliher where he stated that it took months of phoning Gibson before they finally agreed to make him a custom instrument. So, it's not hard to imagine ghost built instruments, even with RFID chips or some other identifying magic. I imagine a good luthier could just port the ID device over to a completely new instrument. Why not? If Alembic can build an instrument out of 20 different sandwiched piecies of wood, what's to stop some one with the skill to cut off the ID device and graft it onto a new instrument? The only obstacle I can see is matching wood grain, which is not an issue with an opaque finish.