/usr/share/X11/xkb/keycodes/ is in xkb-data 2.19-1+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/X11/xkb/keycodes/README
/usr/share/X11/xkb/keycodes/aliases
/usr/share/X11/xkb/keycodes/amiga
/usr/share/X11/xkb/keycodes/ataritt
/usr/share/X11/xkb/keycodes/digital_vndr/
/usr/share/X11/xkb/keycodes/digital_vndr/lk
/usr/share/X11/xkb/keycodes/digital_vndr/pc
/usr/share/X11/xkb/keycodes/empty
/usr/share/X11/xkb/keycodes/evdev
/usr/share/X11/xkb/keycodes/fujitsu
/usr/share/X11/xkb/keycodes/hp
/usr/share/X11/xkb/keycodes/ibm
/usr/share/X11/xkb/keycodes/jolla
/usr/share/X11/xkb/keycodes/macintosh
/usr/share/X11/xkb/keycodes/olpc
/usr/share/X11/xkb/keycodes/sgi_vndr/
/usr/share/X11/xkb/keycodes/sgi_vndr/indigo
/usr/share/X11/xkb/keycodes/sgi_vndr/indy
/usr/share/X11/xkb/keycodes/sgi_vndr/iris
/usr/share/X11/xkb/keycodes/sony
/usr/share/X11/xkb/keycodes/sun
/usr/share/X11/xkb/keycodes/xfree86
/usr/share/X11/xkb/keycodes/xfree98