Mailed out a book using the shipping label/postage bought on eBay. The package was returned with a label saying "RETURN TO SENDER NO SUCH NUMBER UNABLE TO FORWARD." I contacted the buyer and asked for verification of their shipping address, they gave me the exact address as both eBay and the label show. What would be the proper way to handle this matter?

Post Office - RETURN TO SENDER NO SUCH NUMBER UNABLE TO FORWARD | Ask a Mentor

Post Office - RETURN TO SENDER NO SUCH NUMBER UNABLE TO FORWARD | Ask a Mentor | eBay Community