Wood issues

NOT SURE IF THIS IS THE RIGHT SPOT BUT HERE GOES. THIS IS A PM I SENT DAREN. ID LIKE TO GET SOME INPUT AND OPINIONS.

I am having some problems. I am making thes small simple jewelry boxes with lids and the lids are warping up. cupping upwards and not closing flat. the wood haS BEEN IN MY SHOP FOR A WHILE AND IN THIS ga WEATHER I AM HAVING PROBLEMS AIR DRYING DOWN PAST 11-12%MC. THIS WOOD IS DIMENSIONAL LUMBER THAT CAME FROM SOME SHIPPING CRATES THAT IO GET. THE WOOD IN THE SHPOP IS 11% BUT WHEN I BRING THEM INSIDE FOR MOM TO DO HER WOOD BURNING ON THEM, THIS HAPPENS. I CHECKED ONE THAT WAS THIS WAY JUST NOW AND IT AT 7%. WHAT DO I NEED TO DO TO MAKE THIS STOP HAPPENING? ITS FRUSTRATING TO PUT THIS MUCH EFFORT IN SOMETHING FOR THIS TO HAPPEN IN THE END. I GUESS IM GONNA HAVE TO BUILD A SURE ENOUGH KILN AND BAKE THE HELL OUT OF THE WOOD FIRST????? THIS WOOD HAD ht STAMPED ON IT BY THE WAY. I GUESS IF NEED BE I COULD BRING THE WOOD INSIDE BUT THEN WHEN I GO TO DO THE WORK, THE WOOD WILL ABSORB MOISTURE TO ITS SURROUNDING CONDITIONS AND ILL BE BE BACK TO SQUARE 1.
THANKS AND ANY HELP IS GREATLY APPRECIATED.