The order can go through wither your email address is verified or not.
Forcing the email verification before the order can go through would cause a lot of lost orders. People would get frustrated trying to checkout and go to another less restrictive store if that where the case.
Since the order can be placed with out email verification, the order history should be accessible with out email verification as well.
it seams that you want power store to work in a way that it was not designed to work.