Pampers coupons for free diapers- real or fake?

I have heard of people selling Pampers coupons for a free jumbo pack of diapers values up to $13.99. They are selling them in large quantities and I am concerned they aren't real. How do I know if they are counterfeit? I have seen coupons for $2 off in the paper, but never for free diapers.

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