Vault Key Cards is a mandatory prep mission featured in Grand Theft Auto Online as part of the The Diamond Casino Heist update. It is a freeroam mission needed to progress The Diamond Casino Heist.
Players need to obtain two key cards which will be used to get into the mantrap leading in and out of the vault. Once the mission is started, the player is given one of two possible mission variants.
Duggans' Goons[]
Players need to steal the key cards from two of Duggan's guards. One of them will be drunkenly making his way down the streets of areas such as Mirror Park or West Vinewood. The other guard is located inside a semi-random motel, which can be located in Del Perro or Harmony.
Once a guard is approached, they need to be taken out; failing to take them out silently will give players a three-star wanted level. A player needs to then search his body for the card. Once both key cards are obtained, players need to leave the area to complete the mission.
Lester's Dialogue[]
Prison Guard[]
Players need to steal the keycards of a security guard at Bolingbroke Penitentiary. To get into the facility, they must first intercept and hijack a Prison Bus. After getting into the bus, players are also given security guard outfits.
After this is done, the players need to drive the bus to the prison, and once there, they need to wait for the gates to open. Once inside, players need to avoid staying in the guards' cones of vision for too long, as this will alert them. A security guard needs to be found and taken out silently in a semi-random guard tower – it is recommended to take him out with a melee weapon to avoid alerting the other guards.
Once the keycards are obtained, all players need to leave the area to complete the mission. If the guards are alerted at any point during the mission, a four-star wanted level needs to be evaded before the mission can end.