It's a scam. They were asking about some green bag of coupons that was delivered Sunday. It was Sunday and they seemed like they weren't aware of that.
I didn't answer, but based on on of the comments, this could be legit. The green bag of ads is from the Minneapolis Star Tribune. They are supposed to be delivered to everyone who does not subscribe to the Sunday paper. They are usually not delivered at all, or a couple are tossed at the end of random driveways here and there. The Trib might actually want to know if the delivery persons are doing the job. They certainly receive enough complaints about this little marketing initiative...