There will be one weapon case in each area of the map and they will always be found in the same location however they are not guaranteed to have a gun inside.

At the start of the game 3 random weapon cases will be locked and the rest will be blank. They will unlock at random times throughout the game. In order to open the weapon cases you have to solve a password, you will have 7 guesses to do so, if you use all the guesses the password will change and you will have to wait a random time for the case to unlock again.

The easiest way to start is by entering 0123. The password will never repeat a number so you shouldn't put the same number in more than once e.g. 0012
If a number is grey that means the number is not present in the password so it shouldn't be used again. If a number is yellow that means it is in the password but in the wrong location, so you want to keep that number but move it to a different location. You then want to put the numbers that are next in ascending order plus whatever numbers are correct, so from the image above it would be 2 from the previous guess plus 456.

When you move the numbers you got correct but in the wrong place you want to try and remember where they have been so you don't repeat it meaning we now know that 2 does not go in the first or third position and 5 also doesn't go in the third position.

When you get a blue number that means it is a correct number in the correct place. Since we know that 2 now goes in the last position we only have to workout the second number and since we have tried every other number it must be 9.

The weapon case will open a few seconds after you get the password correct. If the weapon case is empty that means at least 1 weapon can be found around the map. If there is a weapon in the case it will leave the shape of the gun when picked up so people might know if you got a gun from the case and also which gun it is. You are not guaranteed to get a gun from the weapon case you are trying to open. Guns now spawn with a 50% chance of being in the case and a 50% chance of spawning on the field and the knife is guaranteed to spawn on the field. All guns are now slightly weaker and the shotgun can now have up to 4 bullets, the guns also no longer spawn with max ammo, if they spawn on the field they have a chance of spawning with no bullets but if you get a gun from a weapon case it is guaranteed to have at least 1 bullet