Looks like this got moved over to the CS forums for you. While there are no GMs on the forums at all, we can help to at least point you to current policies.
Unfortunately, in this case the policy is not to replace the lost items. It’s covered in the sticky in the Classic GD forums here:
Scams and Loot Disputes
Scamming other players is a violation of our World of Warcraft game policies. We will investigate any reports of scamming that we receive and take the appropriate action, removing gains and penalizing those who violate this policy as needed. It’s important to note that Game Masters will not restore any gold or items that may have been lost.
There are stricter limits on what a GM can do when it comes to Classic by the looks of it. Hopefully the scammer won’t be seen again anytime soon!