Not sure what a W serial is but I can check when I get home.
No case. It would be shipped how it was shipped to me. Headstock bubble wrapped and/or foam; inside of a triangle cardboard box, inside of a rectangle box. Stuffed with paper between the boxes.
No neck warp and or/not sure about twisted or warped fret sprouts, unless something has happened on its own over the time its been sitting there. Last I checked everything felt straight, solid, level, with no bad frets as far as I could see, feel, and tell.
If anyone is seriously interested in buying I'd be willing to do a video-call-showcase of the entire guitar so they can see for themselves!
Thanks for the inquiry!