Sellers are not responsible for post sale fees if the the buyer never pays for the item or cancels the sale. The seller is responsible for paying the open invoice within 7 days or reporting a non-paying buyer. You can read how to report a non-paying buyer here. If the “no sale” is reported within the 7 day time frame the invoice will be removed. If the “no sale” is not reported within the 7 day period or is reported outside of normal business hours on the day the invoice is due a credit, not a refund, will be issued to the sellers account.