Small signage is staked outside the Friendly Arm Inn:
"Mithral Full-Plate Armor of 3rd Level Enchantment for Auction
Will consider trade offers.
Leave missives/bids for Rellon Ayloset, room 38. Include your name or it will not be considered.
Auction will conclude at owner's discretion."
And it has been amended.
"Current high bid: 686,000 gp"