rafaelff [1] filed a deletion request for gnome-boxes-git [2]: Long time out of date, this project is under migration from GTK3 to GTK4/libadwaita, with the flatpak-first mod. Safe to say this package is broken and probably doesn't work keeping it in AUR.
[1] https://aur.archlinux.org/account/rafaelff/ [2] https://aur.archlinux.org/pkgbase/gnome-boxes-git/
