This is OT, but last week, I returned stuff to Target without a receipt. Apparently, if a customer pays with anything BUT cash, the store computers have a record of the transaction and can process a refund as if a receipt is present. I thought that was pretty cool.
Walmart.com Returns Guidelines by Department
ELECTRONICS
Computer hardware and components: Computer hardware and components must be returned by mail with any included software within 15 days of receipt.
Computer software: Computer software must be returned unopened within 45 days of receipt.
Camcorders and Cameras: Camcorders and Cameras must be returned within 30 days of receipt.
All other Electronics items must be returned within 90 days of receipt.