With the coupons that start with 9 I find alot of differences between locations. Some don't even ask for them, some want them - but will be ok if you don't have them to give, and (as was the case at OKC today when I returned a rental) at least one wasn't going to give me the discount unless i gave them the printout (which fortunately I did have a copy of buried in my bag). Also, OKC actually wrote my contract number on the printout, so this must be a regular practice there!