I had one a couple of years ago. 3 mo this after tracking disappeared from Aus Post tracking, buyer opened charge back with bank through PayPal, but claimed she didn’t. Despite leaving feedback stating happy with item, confirmation from Aust Post of delivery time and date, email from buyer who confirmed receipt, westpac still went ahead with chargeback and received funds back. Luckily PayPal  protected me so I didn’t lose the funds.