My wife used to work for Sports Authority. They also had a policy to accept virtually anything for return. One time a customer tried to return a Nike gym bag. The manager stood his ground and said he absolutely couldn't return the bag. At the time, Sports Authority did not sell ANY Nike products. The manager told the customer to search the store and if he found a single Nike product for sale he could return his bag and get the Nike item for free. Of course, he didn't find any.
2nd story - The store was next to a Ross store (clothing store). A couple of times people came in with Ross bags and tried to return merchandise purchased at Ross. My wife finally said to one woman, "Look around. Does this look like the store where you bought that dress?" It had only been a few days earlier. Amazing how oblivious some people can be.
Final story - My FIL used to sell orthopedic shoes. These are shoes that are custom made for the patient according to a doctor's prescription. He had one customer who came back with a worn out pair of shoes about 8 months after buying them. He wanted to return them because his foot was better and he didn't need them anymore. And no, my FIL did not take them back.