The laquer probably wasn't set when they sealed it and it degassed in there. If they seal it with nitrogen, then you got whatever laquer fumes lasted and blasted out in your face. Now some people are "allergic" to this or whatever. My grandmother used to get headaches anytime I used something that released fumes. Laquer would certainly do it.
I wouldn't worry about it. If it gets worse over a couple of days, you should probably go see a doctor, but then I'd bet it's a coincidence.