One upon a time (today at about 9AM server time, about an hour ago from post time) there was a chat message across the server. It came from "Cosmosgp1", and they said "Who did this". I asked if I could tpa to cosmos, they said ok. I saw a half destroyed building and cosmos was running through checking the damaged items. The building was the Riften Shop, and the griefer broke all the chests and stole the entire inventory. We have a small list of suspects, but no proof unfortunately. I do have screenshots of the damage done, and you can obviously see the problem:

Kind of obvious how the griefer got into the store. It has to be a town assistant or resident to destroy the building.

The side is destroyed, got into Cosmos' Cobblestone generator and destroyed it (tried to screenshot that but failed to due to the size and close quarters of the generator)

You can see the shop sign and missing a chest with stock. All the floors have this problem. Now we know what the griefer was after.

Supposedly how the griefer gained access before he destroyed the wall. Maybe it was more than 1 person?
After talking it over for an hour going through who it could've been, the 5 players on server seemed to have a few names in mind based on past history. "Gabrielkim123", "Android777" (possibly the same person as gabriel), "Taco" but not too sure on him, and possibly "LadySelena". Obviously we went on the assistants list on Riften and the people with alot of past history and reputation among players are listed above. I even messaged one of the other assistants to the town to see how they would react and it was almost as much shock as Cosmos (plus it was Seba, no way he did it). Could you check the big brother logs and see if anything shows up?