I think that's kinda the worst-case scenario, not the rule. Who's to say the employee won't tell exactly what it is? Why would someone buy a guitar they were suspicious of? I do think your example is possible but unlikely. However, I also think fender should supply parts to major guitars shops for this very purpose. If someone wants a maple board strat they should have a few extra necks in the back. Honestly, I think fender could make that a huge selling point and possibly take a chuck out of the used market if more people could get what they want new.