Men are much more likely to post neg that women in my experience.
I sold a pair of trousers a month ago. They were gorgeous (brand new). I got an email from the husband of the recipient, telling me there was blood and oil on them! I'd bought them straight from the retailer for re-sale and they were spotless. I knew they were.
He said he'd be happy with a part-refund, as he was sure the stain would come out.
I told him to send them straight back so I could look at the stains in question. Then I would give him a 100% refund.
Funnily enough, he posted me positive the next day. He was trying it on. It seems to me that this fella is too.