Jun 15, 2019

If you look on the other side of the tires, in the corner of the room, is a small vault symbol. Pick it up and get ready to move on to the last Vault Symbol! Vault Symbol 5 in Sanctuary: The fifth and last symbol is located on a roof in the middle of town. While in the middle of town you can see a large vault symbol flag on top of one of the roofs.

These are the results of spinning the Slot Machines from Borderlands 2 at Moxxxis 22,362 times. 3 Borderlands Vault Symbol (JACKPOT) (Orange Weapon) 5 (0.02%).
Re: Slot Machine - triple vault symbol experiment I have spent more than 7 million at mad moxxis bar and have gotten around 10 eridium jack pots and no legendaries only lvl 37 got the game 2.

With maps and video. All Vault Symbols locations in all regions in Borderlands 2: Commander Lilith & the Fight for Sanctuary DLC.
Note: the exact location of each symbol on the map pictures is indicated by the in-game mark symbol (not the crosshair cursor).
Other Borderlands 2/3 Guides:

E3 2019 VIP and Shift Codes.
Effervescent Rarity Gear Gibbed Codes.
Achievement Guide (Commander Lilith & the Fight for Sanctuary DLC).
OP10 Gaige Anarchy Build / UCP and Vanilla Compatible.
BL3 Trailer Secret Shift Code.
Golden Keys Explained.
Shift Codes (2019).

The Backburner - 2 Vault Symbols

Vault Symbol #1

At the beginning of the area, in a yellow structure on the water.
Vault Symbol #2

Closer to Brick's house in the HQ.

Dahl Abandon - 5 Vault Symbols

Vault Symbol #1

In a corner of the huge ramp at the south.
Vault Symbol #2

On the small town west of the map, find a ledge on the map's wall, the symbol is at the end of this ledge.
Vault Symbol #3

On the area at the north where you find Mordecai's post, behind a collapsed container, right at the entrance of this area.

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Vault Symbol #4

Just above the previous symbol, find a drawing on the wall and jump to the ledge to your left, follow the path to find the symbol.
Vault Symbol #5

On the Mine 191 area. To access this area you must activate the Claptocurrency mission given by Claptrap on Dahl Abandon. 1st picture shows Claptrap's location (progress on the main story missions until he becomes available). 2nd picture shows Vault Symbol's location.

The Burrows - 2 Vault Symbols

Vault Symbol #1

At the beginning of the area, on a ledge at the map's south wall.
Vault Symbol #2

Near the end of the area, on the ceiling of a structure closer to one of the generators you have to destroy.

Helios Fallen - 6 Vault Symbols

Vault Symbol #1

At the beginning of the area, take the ramp near the volleyball's net and then to your right. The symbols is on the floor.

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Vault Symbol #2

On the area with the elevator. This one is on an high structure you can't reach 'normally' (2nd image) and requires very tricky and precise jumps. It's better if you can watch the video as it's hard to explain with text, but I'll do my best. Near the location on the map (1st image) there's two yellow boxes in a corner (3rd image) jump over them until you reach the ledge on the wall just above the boxes, from that ledge jump to the other next to it and then jump to the scaffolding right in from of it. This jump has to be very precise as your character has to get 'stuck' on the scaffolding, then move slowly to your left and jump from the scaffolding to the area where the symbol is located.
Vault Symbol #3

Below a ramp near the red Claptrap in the display case.
Vault Symbol #4

Closer to a save point and vending machines.
Vault Symbol #5

At the top of a yellow structure on the corner of the area. Jump to the nearest pole and then jump to the structure to find this Vault Symbol.
Vault Symbol #6

In the Control Room, in some boxes behind the one-way-only Fast Travel Station. Borderlands 2 How To Get Three Vault Symbols Slot Machine

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Mt. Scarab Research Center - 3 Vault Symbols

Vault Symbol #1

Near the start of the area, go down the stairs. The symbol is behind some boxes.
Vault Symbol #2

In the prison cells area, go up the ladder. You'll find the symbol on one of the cell's bunks.
Vault Symbol #3

In the lab. Behind one of the bunks.

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Writhing Deep - 3 Vault Symbols

Vault Symbol #1

Up in the office, behind the elevator.
Vault Symbol #2

High above in the wall just outside the office. To reach it, start the battle with Haderax The Invincible a use the nearby geyser to propel yourself up there.
Vault Symbol #3

High above in the wall just above the area entrance. Just like the previous Symbol, use the nearby geyser to propel yourself up there.

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All Borderlands 2 Guides!

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The slot machine is a new addition to Borderlands 2, and it allows you to spend all of your hard earned cash for the chance to win fantastic prizes.

The amount of money it costs to tug the one-armed bandit varies depending on your character’s level—as do the weapon rewards.

Eridium, character skins and cash are dispensed through the front tray, while weapons are acquired through the side tray on the left.

You can find two slot machines in Mad Moxxi’s bar for double the fun. You’ll also come across them in the wilderness, occasionally hoisted by a rare enemy called the One Armed Bandit.

A handy tip: Play the slots with a group of other players to multiply your cash and Eridium rewards.

Another handy tip: While your friends are doing their shopping in Sanctuary, just head on to Moxxi’s bar and gamble while you wait. Money has little use apart from buying ammunition and rare items from stores and you’ll always find more cash to buy ammo should you ever run out.

The odds may always be in the house's favor, but it's not like you've anything else to do with your money.

Slot Machine Rewards

Three Psycho Masks : A live grenade. This “reward” is the only one that’ll hurt you by doing more than taking away your money. Be sure to avoid the explosion.

Three Single Eridium : One stack of Eridium (4 pieces)

Three Double Eridium : Two stacks of Eridium (8 pieces)

Three Triple Eridium : Three stacks of Eridium (12 pieces)

Three Sevens : An uncommon rarity character skin from a weapons manufacturer.

Three Bells : More money for you to gamble with!

Three Cherries : Uncommon (Green) weapon

Three Moxxi Symbols : Rare (Blue) weapon

Three Marcus Symbols : Epic (Purple) weapon

Three Vault Symbols : Legendary (Orange) weapon

A pair of symbols with a bell: A small amount of cash.

A pair of symbols with a non-matching symbol: Common (White) weapon