What is a Confirmed Address?
A buyer's Confirmed Address is checked against the credit card billing address maintained by his or her credit card company, or is verified by PayPal. Because Confirmed Addresses must be in the name of the account holder, Gift Addresses can never be confirmed.
What is an Unconfirmed Address?
My address is no longer Confirmed, but it used to be. What happened?
Addresses can become Unconfirmed if the credit card associated with the address is removed or expires. In addition, you may have two identical addresses available to you during the eBay Checkout process, but only one of them will be Confirmed. To make sure your Confirmed address is set as your primary eBay shipping address, click the "set as primary address" link from your eBay address book.