I think this was a gimick just to get people in the restaurant.
Here's my story.
I have my coupons, decided to try yesterday to redeem one even though I had heard they are probably still out. I get to KFC, see the poster on the door explaining rain checks due to overwhelming response.... I decide to go inside and get the rain check anyway, was told I needed to fill out paper with my address so new coupon could be mailed to me etc. After all this then get asked,,,so, do you want to order? I immediately said, NO I'm good thanks, and walked out. Obviously they knew the response would be huge and would run out of the free product and once people are in the restaurant they will just order something NOT FREE.
Think I'll ever get the coupon in the mail.
You're right Horace, this is a masterpiece of marketing.