YOU WILL not know their correct address until they pay

when they go thru checkout THEN and only THEN do they decide to which address they want the item sent.

Often that is not their registered ebay address, but can be their work address, a family friend, whatever.

I have items sent to any one of 6 or so different addresses, just by picking the Shipping Address in Paypal

that is the ONLY address that covers you, as the Seller, with PayPal Seller Protection.

just be patient. many many bidders place a bid in the last 60 or even 30 seconds of an auction end