Golden Grin Casino Location of Pit boss :: PAYDAY 2

The Overdrill Exists.
I think we already have the "overdrill" within the game. My speculation is that the BFD itself IS the "overdrill", and the spot we are drilling from is incorrect. As the vault metal is the wrong colour. (Disproved by this point.) Take not that the Private is written in red and not white - this can be seen in the back areas of the GGC. This implies we are drilling and planting C4 in the wrong location.
I've also paid attention, during GenMcB's stealth run on DW - one can see the loot room looks identical to the one seen in the trailer at the end.
For comparison:
GenMcB Room: https://youtu.be/wHY8dktUWa0?t=14m58s
Trailer: https://youtu.be/yJieyOGppM0?t=1m35s
So - we are drilling the wrong vault entirely because as Bain states: The Dentist is very unhappy - implying we found a fake.
Now what?
The Guide of Bain has similarities that appear within the GGC.
1) Codex Raptus is the "Loot".
It is resembling the Dentist's loot, but not accurately. I've also taken note that the GGC is at night, and the page also is at night. So - the castle must be the GGC.
EDIT: A Latin translation of Code Raptus means:
Codex- Latin caudex for "trunk of a tree" or block of wood, book; Raptus- Raptus is the Latin for "seized", from rapere "to seize"
This is an implication of stealing something.
2) Notice the balloon in The Criminal Net-Work.
We see a blimp in GGC. While nobody is piloting it - something is making it move over the castle.
3) The Dentist's loot resembles the chest burning in Strategies of the Successful Heist.
We know for a fact that The Dentist has disdain for the correct normal way of completing GGC. So we've got the wrong chest. (Notice the criminal is looking at the wrong direction.)
4) Tools of the Trade.
Tools of the trade has several parts - namely:
Inner Wheel:
Congelation (twelve o'clock) - an increase in viscosity. A liquid - perhaps the one used for the BFD? (Mercury - the fluid connection between the High and the Low. We know the blimp is High and the Vault is Low. )
Salt (nine o'clock position) - base matter of alchemy - but could be the base of the drill? This could be a circle - and partially resemble platinum or the sun.
Sulphur (three o'clock postion) - the omnipresent spirit of life. (Electricity?) However, this may relate better to the Grinder perk deck.
Multiplication (six o'clock position) - this one is very much wrong - as it is the only symbol that does not match perfectly.
What appears to be a bow - or winch as it is being hung from a tall "arrow"
The cylinder - or what looks like the metal plating from GGCs vault once the drill has finished. Not sure of the details on the piercing - but I will find the connection.
The gravestone - implying that a crew member must be dead - see 7.
Sun and the Moon - both appear to be looking - so could be a relation to "let them watch".
5) Lady Justice, the three stars and the "IV"
This is the only loose end I can properly think of. We see other Roman numerics elsewhere, the Jewelery store does have one, and so does Diamond store, if I remember correctly.
6) The Alchemist
This is the tricky part - because I've seen numbers within the GGC, but in four distinct places: The Vault keypad, and the three suitcases containing a number during stealth and loud for the armory. However, the dice possible refers to "craps". As the Dentist said: The Golden Grin Casino has more than just cards and craps. Craps is played with dice.
7) "Mendax"
Like with the gravestone, death symbolises that a crew member must be in police custody.
The chessboard is located within the GGC. It's use on the other hand, is not quite clear.
Mendax itself refers to deceit, lying, untruthful, false feigned, not real. Likewise, the loot may be Mendax.
The timer implies we are out of time: much like the Overdrill: you had to wait until the timer completed. Maybe the BFD has to complete or another timelock must complete?
Horseshoe - often associated with luck - but in this case: it's Lady Luck, which is often known as the one playing the table at a casino.
8) The shadow and sword in the ground.
The man depicted looks like he is following instructions - much like the ones used for the original Overdrill, while the background indicates that he has successfully heisted. However, the start of the GGC, the stealth option allows for items placed elsewhere - allowing you to be un-noticed by guards and cameras. (Note: not sure if guards notice you when close up without equipment.)
The sword itself refers to the equipment.
9) Prisoner's Escape
The prisoner appears to know his escape - so a teammate must be freed from Police custody.
The prisoner also has numbers on the walls - these may refer to the codes for the vault - or something else.
Notes: These are my personal theories - because not all of them connect properly. I will note that the outside of the Tools of the Trade ring is strange. This is because I cannot find those symbols even with my master of using search engines.
tl;dr
The Golden Grin Casino is the most likely place where the BFD should be bolted to another place within the casino to find the hidden vault - as stated by The Dentist himself. Positioning might be key, as seen with Mendax's chess board.