I think my post may have been misunderstood. I wrote that I bought "two new Taylors from a dealer and one other brand, new, that was shipped across the country." That means two Taylors shipped to my local dealer from Taylor and one guitar of another brand that was shipped across the country by a private party.
Diagnosing and solving a problem like a buzz can be very difficult, and I will never again accept a Taylor with a buzz in hopes that the cause will be found and fixed. I only got rid of the first problem when I sold the guitar, but was pretty astounded when the second guitar had the identical buzz, on the same fret.
In the case of the third guitar (private-party sale), the owner detuned it (error!), packed it, and left it sitting in the box for a couple of weeks in a hot, dry climate before shipping it. By the time it got to me it had a serious bow in the neck and I refused it. We then haggled about who was at fault and who should pay for shipping. I had trouble getting a refund from this seller and he charged me shipping both ways. The lesson here is that you have no control at all over what the other party on the other side of the country does---how they pack the guitar, whether they honor the agreement you made, etc. There are so many chances for something to go wrong here. I would never do this again.