I m pretty sure that you need to prove that you bought it...so that would kind of require a receipt. I m not sure though, I usually don t bother returning stuff so I d ask if you need it, you might not. They might just be happy to take it for store credit, maybe.
In my experience with Walmart, you would need a receipt to get your money back along with your driver s license. If you don t have a receipt they will give you store credit but you also need your driver s license. They won t even talk to you with out that driver s license. They made me go out to the car to get it.
Each store has their own policy on returns and they re usually posted in customer service areas. When I worked at a certain store, we could only do cash refunds if you provided the receipt, otherwise we would give you that cash amount back on a gift card so you could only use that money in our store.