Gibson cork sniffing all relates to the mythical "vintage accuracy":
* Plastic colour - pickup rings, pickguards
* Knobs - colour, height, fonts used
* Tailpiece location - on LPs, should be at a slight angle like "bursts"
* Neck tenons - short, medium, long
* PAFs - need I say more?
* Brazilian Rosewood fretboards
* The 'right' nitro-cellulose
* Lacquer checking - doing it with a razor blade or a freezer/heater
* etc
The list goes on :roll:
And remember, anything Murphy aged (or even just painted) commands a huge premium.....