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99 Boxes is probably one of thehardest heistsinPayday 3to complete in stealth mode, as from one point on, you have to wear your mask, which reduces your options to keep things quiet. That being said, if you manage to play hide-and-seek with the guards and learn about the position of the cameras, there shouldn’t be any more challenges.
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The problems with 99 Boxes usually begin when you set up the zipline and head to the other yard. Using the zipline will require you to wear your mask, and at this state, the only thing that could help avoid ruining the stealth is to stay hidden from literally every NPC — or you have to kill them. That’s why you are highly suggested toequip a silenced pistolin this mission.
How To Get The Blue Keycard In 99 Boxes?
The Blue Keycard is always being carried by a guard in the secure area of containers. This means you will need to look for itafter using the zipline. It’s not always carried by the same guard, so you need to look for it on your own. If the movement pattern of the guard doesn’t have any safe spots to steal the keycard, you may distract the guard by jumping on top of the containers and making some noise.
At this point, the guard will start searching for the noise on top of the containers, which makes it quite easy to follow him and steal the Blue Keycard. You can evenkill the guard when he is on top of containers, as it’s usually a place hidden from plain sight, though you have to be aware of the cameras and their blind spots as well.

What To Do With The Blue Keycard?
You can use the Blue Keycard toget inside the Security Roomwhere a guard is watching the cameras. If youkill this guard, all cameras on the map will bedisabled. Regarding the fact that you already have your mask on after obtaining the Blue Keycard, it won’t be much of a risk to kill the guard in the Security Room. But make sure to answer his radio after killing him.
In case you don’t know,the Security Room is located in the same warehouse where you install the Liquid Cooleron the getaway truck’s container.
