The special safe at the Maison d'Abbatage seems like a particularly weak loot spot most of the time. For instance, I just opened it to find a Candle of Visibility, a Ring of Arcane Stillness, and Hands of the Dawn. This was at max spawn.
Not sure if the loot is averaged out over the other chests in the dungeon, but if not, this one seems bad enough to be worth commenting on, especially as many PCs will probably be having to pay quite a bit to open it.