Hey, not too far away from me, im in Springfield!
Wood moves, its the nature of the beast, so if youre trying to stop that entirely, well, may want to take up metalworking. That said, you can mitigate it. The first step is starting with wood thats been properly dried and acclimated. That step is the one that seems to get most people, if you try to use wood too soon after its been milled, odds are it wont have reached its final dryness. Buying from a good dealer and letting the wood sit in your shop to be certain is the best way to accomplish this, and to my ears this sounds like what you may have had happen to your box. Extreme warp generally has this at fault.
Second thing you can do has to do with the finishing method; you need to make sure to balance the finish on both sides of a piece, and in general a film finish will help slow wood movement the most by making it harder for atmospheric moisture to penetrate. In my experience, the first is more important than the second, a finished piece of wood will move the same as an unfinished piece, just slower, but a board thats had one side finished with the other side bare will very quickly turn into a potato chip.
I will say that climate-wise, i havent had any major issues with my projects, provided the wood was properly dry to start. Really, unless youre moving a table top from florida to arizona, i wouldnt blame changes in climate for major warp. Sure, swings in humidity can cause some movement, but ive found the Missouri climate to be pretty stable as far as that goes, going from summer to winter or even from my stupidly humid basement to my very arid upstairs hasnt caused much in the way of movement with my projects. Like i said, id wager that the biggest issue was that your wood may not have been completely dry when you started working with it