Plutonium

A little late so sorry. You can use the gsc dump to get maps gsc code.
https://github.com/plutoniummod/t5-scripts/tree/main/ZM/Maps
Each map has a file called "_zombie_mapname.gsc", this will show what weapons are included in the map. You can't just put weapons from other maps in but this could change in the future. Although this isn't what you asked for it's the best for choosing weapons for a map.

You can look at this post related to it but for BO2. Pretty much ddo samething if you want to do that.
https://forum.plutonium.pw/topic/570/how-to-remove-or-add-weapons-to-the-mystery-box-in-zombie-help-gsc?_=1657952593077

@dontknowletsplay my bad, I accidentally left out the last few lines of the script. So we good, thx for the script.

JezuzLizard every player that have joined my server told me that they can see the mod menu when i open it but they cant use it