What if the Taobao exchange boss says he hasn't received the goods yet?

You said that the seller received your goods, but refused to admit it. Did you leave a copy of the courier and waybill when returning the goods? If yes, you can report the single number to the courier company and ask him to check it for you. If the courier finds that the other party has signed for it, you can ask the courier company to make a copy of this list for you, and you can take this signed courier list to Taobao to complain. But act quickly, otherwise Taobao has a regulation that the seller will automatically pay the seller ten days after delivery, and then people and money will be used up.

I hope my suggestion is helpful to you.