Red Handed

Enter Graystone Yard.

Track "A supply Thief", and be in stealth when you approach him.

Follow him until you get a quest update, then hail him.

After a short dialog, he will be come agro. Kill Him.

Collect the stolen goods (treasure chest chest clickies behind where the thief stops).

Head to Qeynos Harbor and return the supplies to the dock workers who are easily spotted on the docks.

Return to Rysian Gladewalker.

Reward: XP, Banner Of Bayle, +1000 tunarian alliance.