I just helped a guy drive cross country in a uhaul.We dropped off a solid body that another friend wanted to check out to probably buy.When I inquired later as to whether he liked the guitar he said he did but he said he had looked down the neck,noticed it wasn't straight and started adjusting the truss rod to bring it to where it looked right..I asked if he had adjusted it 1/4 turn or so,he replied that a well known tech had said that turning the truss rod gradually and waiting for the neck to take a set was a myth.In my opinion,the neck had,to me,a proper,even amount of relief or bow when we left on our journey of between 1/32-3/64 in the middle of the neck.I checked by fretting individual strings at the first and past the last fret, and compared the relief of the neck to the strings under tension.The neck is,in my opinion, in great shape no fret wear,I think it's an outstanding neck. After he had adjusted the truss rod he said that " now one side towards the body has back bow, and towards head stock has a hump ".he said, that "he thinks I know that I can tell you that the neck has bit of problem. With your permission, I can try to tweek it bit more or get a second hand opinion".that statement made me feel abit sick so---- My question is what do I do? I have built and refinished guitars for years and would not have adjusted a neck on a guitar that had just traveled cross country,I would have let it aclimate.I also do not trust the, look down the neck and turn the rod theory, especially if I was going to give it back-- Should I a. as a tech buddy I spoke to said,tell the prospective buyer "you messed with the truss rod and thus cannot return it in original condition so you've bought it". or, b. return it to my other buddy and tell him that the guy didn't like it or c. return it to him and admit that the prospective buyer had been adjusting the truss rod as soon as he took it out of the case. What would you do????