To find out if the seller will post to the overseas address go to your account tab and add the African delivery adddress to your delivery addresses and then mark it as primary. Go to the item and attempt to bid/buy, if the seller posts to that country then your bid/BIN will go through, if it doesn't then the seller does not post there.

As you have chosen that address pior to bidding that is the only address the seller will see, don't forget to go back to your account and select your usual delivery address as prime.