My neighbor saves her coupons for me,and no problems at all. i also have a PO box and i get coupons/flyers there too..
my DD is a teacher..was save them all for her.
i do know that you need them to scan the name/address bar code occasionally, to keep the flyers coming to you house.
we have 2 joanns in our area, and i use coupons in both. not sure about out of state..