Jernevar Merchant's Vault

Buried beneath the silt and sediment within what was once a house in the town of Jernevar is a door, locked and sealed tightly. The door itself and the walls of the room behind it are warded heavily, blocking magic from penetrating or altering them, and the door's lock is still magically sealed, significantly increasing the difficulty of opening it without powerful magical assistance or the matching key.
The small room behind the door contains some of the treasures and many of the workaday inventory of a small merchant house based in Jernevar. Besides a number of barrels and jugs of spoiled food and drink and an assortment of odds and ends that might be sold in a general store, there are two small chests containing an assortment of coins made by an unknown mint, a shelf bearing a half-dozen tomes, a rolled up tapestry (Jernevar Tapestry) and a two-foot-tall mirror on the wall (Jernevar Magic Mirror).
The tomes are of interest because they contain the business accounts and some small amount of personal commentary by the proprietor, though their name and that of their house are never actually mentioned in any of the books. Most of these accounts are mind-numbingly boring to any but an archaeologist, but one entry stands out to a discerning adventurer, describing a shipment of expensive religious idols that went missing en route between Brennandi and Kaltwel (or Tinkertown as it's known by its current residents). A guard who went missing around the same time was suspected of having absconded with the chest in the middle of the night. A search of the hills to the south of the road produced a few tracks, but the chest hadn't been found as of a month after the loss, and the guard hadn't been seen at any of the surrounding towns, so the idols were presumed to be "taken by the desert" and written off as a loss.
One other interesting bit of information that can be found in the tomes is that the merchant was dealing with taxes instituted and dictates handed down by both a Magistrate and by a Grand Magistrate. Though the difference between the two ranks isn't entirely clear from the entries, it seems a safe guess based on what information is present that the Magistrate was more interested in local matters, and the Grand Magistrate was a regional leader.