I sold this 'thing' to a bloke on another forum. Paypal received, next day delivered, then buyer confirmed 'thankyou received as expected'.
2 months later, the bloke pops up and says it doesn't perform as expected and on inspection is 'past its best'. I used it six weeks before posting it and it performed as described. It's not electro mechanical so couldn't/wouldn't have degraded in the intervening six weeks.
The bloke wants a refund 2 months after despite having the intervening period to raise the issue and having confirmed safe/correct receipt.