I had two Malaysian ladies it looked like who had both bought a shit ton of the EXACT same shampoo, all got 4 giftcards each, and had the same identical coupons. Now, don't go and always assume what you see is actually coupon fraud, but I was 100% sure and i shut that shit down... turns out it was lol.
I didn't go up and say "Hey, you guys are committing coupon fraud, I can't let you continue" it was more like "Hey, you guys reached your limit, we can't accept any more of your coupons, sorry!" and one of them was in such a big hurry she decided to just leave everything... lol. I took away 4 full bags of Loreal shampoo, Olay shampoo, and some other brand, and took it to guest service and surprised them lmao. I feel bad for whoever had to restock that all.