There is very little information found in old newspapers about the Coupon cigarettes I found this cigarette sales ad in an Austin Texas newspaper that has Coupon cigarettes in it.
Coupon Cigarette Ad Austin_American_Statesman_Sat__Mar_14__1914_.jpg
Here are few images I found of two different Coupon packs
Coupon Cigarette pack.jpg
Coupon pack 2 side.jpg
Coupon Pack 2.jpg
and a 200 count carton with 10 packs of 20 (I'm not sure where the claim that they were packed loose in these cartons came from).
Coupon cigarette carton.jpg