Gonzalez noted that if scams like this one become more common, manufacturers will have to rethink their coupon strategies.
"Ultimately, this could have an impact on consumers," Gonzalez said.
Here are some tips from Miller on how to avoid fraudulent coupons:
Never pay for coupons. Counterfeit coupons are often for sale on eBay or other websites. "Coupons are free," he said.
Never use "free product" coupons from the Internet because they are frequently fakes. Manufacturers almost always require consumers to buy something to get an item free.
Never use a coupon that you can see the entirety of on your computer screen. Legitimate coupons are partially obscured on the screen to prevent multiple copies form being made.