While the hellhounds hunted down the cult, Noah and Luca walked along the corridors of the conspicuous castle-like building they went in.
Based on Luca's narrative, this building was a normal two-story commercial building on the outside, but it had five floors worth of basement that was designed to appear like a castle under the mountain.
In such a highly invested place, there was bound to be important things to be hidden. Aside from the actual sacrificial hall and the bones of the other sacrifices, financial records should be kept here as well.
This might not be a warehouse like Noah wanted to find, but this place should do if they found the business documents here.
"I can pick up electronic signals from a room two floors above us. Let's see if there's a computer connected to the Internet there." Luca ushered Noah forward to move faster in case someone went to that room and began destroying the files they needed.