Hi, I didn't get notified that you've posted it here, but Steam is not nice for such discussions, please consider joining our Discord instead.

Weapons you see in boxes are tightly tied to the faction you are fighting with, essentially these are the weapons the soldiers use.

Well there is a way, but you will need to specify something like 40 class names yourself and ensure that it works. Faction file looks like this:
https://github.com/Sparker95/Vindicta/blob/development/Vindicta.Altis/Templates/Factions/CUP_TKA.sqf

Good thing is that faction verification is highly automated, so you can't specify a non-existant class nameand make the game produce error because of that.