My guess would be 1%-3%, Ive always though it was likely very low. Its just a guess though....
Ive bought a few larger groups (50-100+ examples) of Zeenuts over the year and often none will have coupons, but then Ive also bought small groups of 3-5 cards with all having the coupons too. It all depended on the original owner if they clipped the coupon off right away or decided to just leave the cards whole.
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