Really Lazy Bear 
I took the Adwaita and Adwaita-dark folders located in /usr/share/themes/ on my cachyos vm and placed 'em to the ~/.themes folder in my void linux vm, lol. It works tho
I don't know the name of the package that provides the adwaita-dark theme for xfce on void linux so yeah.
Just nabbed something from another vm to another vm like it's nothing. it's weird haha
Haralds Jakovels