Locating, identifying containers, and their loot lists

[Osuirof]

1. What file, and where, contains the info about containers\merchants loot\inventory?

2. I would like to figure out which container is which, and what loot list it uses.

For example, I would like to know, what loot list the containers in Borsodi's Vault use.
Tried to figure it out looking at loot lists, and comparing with what I get ingame, but it didn't work :(

3. Is there a way to place a new container, merchant\whatever?