I'm surprised at the advice to pull the neck off. When y'all are selling instruments, do you let buyers do that?
If I was selling an instrument and someone arrived with a set of tools and proposed taking the instrument apart, it would be a hard no. 'Cause I don't know if that random someone knows what they are doing, if they know how to put it back together properly, if they are about to bur out screws and damage threads, etc.
If I was selling a '62 Strat for tens of thousands of dollars, I would certainly agree to take it to a luthier or instrument valuer with suitable insurance to take it apart and verify the year and the matching components, but…