This is the exact reason virtually all guitars need to be set up again once they arrive at a store from the factory, despite being "setup" (and i use that term loosely) at the manufacturer.
The amount of time spent in the back of a UPS truck has more to do with it than the truss rod adjustment that may or may not have been made at the factory. This is an enviromental change, not a direct result of a truss rod adjustment. Going from, for example, a humid Fort Worth summer to a beyond dry Phoenix summer is going to unleash the fookin fury all over a guitar.
The key phrase here, for me, is "over time". The question is over how much time? Newer guitars won't react the same as vintage pieces, and in general can take whatever truss rod adjustments you can throw at them without blinking. My favorite example of this is a Charvel Standard I set up. When it came to me it had so much relief you could tell from the side, from across the room. A quick crank of the truss rod, damn near a full turn, straightened the neck out perfectly. I even put a straightedge on the thing to make sure I wasn't crazy. I had 12th fret action under 1mm, with no buzzing anywhere on the board. Perfect! The order it was on got put on hold, so it had to sit in the warehouse. Three weeks later when it came back in, it was in the exact same condition. It had sat in a warehouse in the middle of summer for three weeks and hadn't changed a bit.
Obviously, this got me thinking that maybe all the crap I'd heard about truss rods wasn't exactly right, so I started paying closer attention to guitars that I set up that subsequently spent some time in the warehouse. It was very rare that any of these guitars needed further adjustments. When they did, they were usually minor adjustments. I realize this is anecdotal evidence at best, but it brought me to this conclusion...
There is no set way to care for a guitar. Period. Guitars made of wood, for the most part. No two pieces of wood will ever react the same to given conditions. They both might warp, but their movement will be different. Don't rely on books, or even other people, to tell you how to care for your guitar. Learn how to make adjustments and just PAY ATTENTION TO YOUR GEAR. It will tell you everything you need to know.