Ran this adventure last night.
The players were led to the vault entrance by an NPC, who didn't have information on what the vaults construction was and was sending them it to retrieve an artifact for the church.
Their run through here was fairly straight forward and out of the box thinking didn't happen much. The mage did start collecting the loot in the museum hallway with an unseen servant before anybody set foot in the hall.
Unfortunately there was 2 fatalities in the dungeon as Fido the wonder dog and Felix the useless cat bought the farm.
Felix died when it's master exploded a Death Sphere next to them. Poor kitty.
Fido got the attention of The Hoard for one round when he outdamaged his master. Bad Dog!