Pam there are several things you could try such as asking the buyer for a stat dec that they did not recevie the item, report the buyer to the police online fraud squad and inform AP that a lot of parcels going to that particular address are going missing.

While you might still have a neg at the end of all this at least it won't hurt as much once you have taken some action.

As for followup feedback maybe you could leave it until the last possible days in case anything happens and you can get the neg removed by ebay.

Sometimes a followup just brings more attention to the neg that if you ignore it.

Good luck with it.