If you get the note first from upstairs, you don't lose it if you get kicked out. Do this part first, and that will make the other part easier.
When you try to get in the vault, first thing to do is to wait for the roaming goblin in the hallway to start walking away. Open the vault doors. Another goblin will come up to the door, wait until he is going off to the left. Once he is doing this, go off to the right, and hug the wall. Once you are there you are safe. When you are near the vaults, wait for the roamer to head to you, than away from the vaults. Once he is gone, go up to the vaults, get the update, then back up again to the safe spot. Read the note. Then wait for the goblin again. Once he has roamed by again, click the vault second away from you (third from the left), and wait. Click it again really fast after that, and wait. Once this is done you will have the coins. Sneak out the same way you came in, and you won't get kicked out.
If for some reason you are trying to do this with a class that has a pet, you can send your pet in to attack and will not have to worry about being kicked out.
If you evac while inside the hideout you will end up outside the entrance to Runnyeye, not the entrance to the hideout or the docks as you would hope or logically think you would.
They DO see thru invis
Spirit Totem of Goblin worked beautifully though.
