Hello all. Does anyone know how to add/remove weapons from the mystery box

Open: 'dlc3_code' inside your modfolder. (Add the file to MAPNAME/maps, if you don't have this file.)
Search for this: 'include_weapon( "zombie_ppsh" );'
 
There you can add weapons to the mystery box.
 
With this: 'include_weapon( "zombie_ppsh_upgraded", false );' can you keep weapons out the mystery box.

Yup that works! And if i wanna remove weapons i would have to delete:    include_weapon( "m2_flamethrower_zombie" );   - For Example?

Yes!