What Happens If You Are Wrong About Which SKU Is In Which Case?

I have just packed all of my products into their cases. Unfortunately, I completely forgot to keep track of what ended up where! All of the products are individually boxed and labelled within the cases. What will happen if I just guess at what is in where, and I turn out to be wrong? Do I need to open everything and take it all back out? I’d really prefer not to.