There were multiple scams that regard "manufacture printed" coupons that are not legitimately made. Allow for a person to test the validity of the coupon before you start your sales.
gyfts is right however if the coupon scans as you say it does i see no problem with the it. even if its fake no one would be able to tell.
If you look at the image above he posted there is no barcode so not sure if it would scan. If there is a barcode I think using these would be a lot easier.
Sometimes at retail shops they're able to type in a code into the register rather than scan it. The pictures are small but I think I see a code which I assume is the way to redeem it. Anyhow, OP, there is no guarantee this works. For all we know, they could be photoshopped coupons.
i doubt that is how you are supposed to redeem it i dont see a code anywhere on that example. if there is one it would be in very small type
generally the coupon code would be larger type especially if it doesnt have a barcode.