Best thing to do is check them with a moisture meter to see where they are at. I'm sure they are 18% plus and you are stuck with them for awhile. If you try to force dry them, they will check badly. Just taking the wax off them in a dry climate, they will probably check within a week or two.
I never buy wood that is not under 12%, and never covered in wax. It has to be under 10% for me to use it in a riser, preferably 8-9%. Now that you have it I would wait until your most humid season then take the wax off and let it dry for a year. Just my 2 cents. Good luck, Chad