This is going back aways - last century sometime when colour lasers were expensive, hefty machines. I was in the Tech area at Officeworks, and someone came in on a Monday morning wanting to return a printer. The store policy at the time was pretty much no questions asked, as long as the item was in 're-saleable condition'.
It would be marked down 30% and put back out for sale.
So we processed the refund 'item not suitable'. Life goes on.
Next monday morning, same thing - same guy. Turns out he was President of his son's football club and printing out the newsletters each week with a brand new laser, then returning it. Free ink until we told him to piss off and never come back.