In a big box store I’m familiar with, a customer brought back a toilet...used. Sometimes riding mowers or snow throwers are brought back after a season of use. Tools are brought back after use. I heard a customer brought back automotive tires to a store that never sold tires. More often than not, customers demand, management capitulates. There are unreasonable customers. There are customers who scam.
I can remember stories on another site of people who bought motor oil that turned out to be used oil that had been poured back into the jugs and returned. All I can say is WOW.