Amazon allows you to return a defective or damaged item for refund or replacement. Basically Amazon will provide free return shipping label to return the product to one of it’s fulfillment center ( if it is an Amazon error — defective/does not work properly)
Why refund without returning the item?
Sometimes it could cost more to ship back and store a damaged product, if that is the case Amazon don’t want you to return the product to reduce their cost and issues refund/replacement.
Looks like Amazon has a certain dollar amount under which you don’t have to return the item. So you can just keep the item, if you get below message when you apply for return.
Your Return Summary
We are processing your refund. You don’t need to return the item back to us!
Note: This might not be the case for all products. this depends on the item and the seller.