I ordered a CE package on SE online store, it was shipped last week and still on its way...

Will I somehow get my product key on some emails so that I can register it on Mogstation? It's saying that only 4 free trial days left, and I have no ideas what will happen to my character if I can't input the product key in time (I will be out of the State for a week, which means I may only get my box set on next Wednesday)