Similar happened to me with a shaft here in China using Xianyu.
I sold it to a person, who had clearly bought it without paying attention to the required thread of his butt.
I had explicitly said no returns in the add, and provided pictures of the shaft on my end in detail.
He damaged the shaft and tried to initiate return after I refused to accept it as return.
The process through Xianyu is interesting, in this instance, it initiates a peer review for 48 hours whereby users of the APP vote, if the vote is in favour of the seller, it is reviewed by Xianyu directly. They requested I send them any further evidence.
Luckily I also had videos (which my phone had metadata for with relevant dates).
Money was then mine, no refund required.
Does PayPal have a similar review feature Jay?