The gryphon master in Westfall is Thor. If you've spoken to him before, then you can take one of my gryphons to him. That's a good lesson to know: gryphons are always trained to fly to their capital city, but they'll only take you to a remote gryphon master after you've already been there. You've already been to Thor, so just speak with me again when you're ready to take a gryphon to Westfall. Once there, you can deliver Osric's Crate to Quartermaster Lewis.
You're back from Stormwind? Did Osric send the armor?
Great, you brought the armor! We'll get this divvied to those who need it immediately. Thank you, <name>. Your efforts have been a great help to us. And now that you're no stranger to gryphons, I hope you'll come and lend your aid to Sentinel Hill often!
Upon completion of this quest you will gain: