The seller mailed the intact book package, and the buyer found that the corner defect was serious after receiving it, and asked for a return without paying the postage. Is it the fault of the courier?

In fact, there are mistakes, but this general express delivery will not be managed. Generally, the damage of goods has nothing to do with the delivery outlets. It usually breaks down on the way, so it is not easy to check the problem. You can only talk to the seller. It can only be said that the seller's packaging is not good and can refuse. If the seller doesn't refund the money, you can ask Taobao to intervene. I hope this helps.