Repeat the find command if the first run comes back with no result.
I do not know why but I often have to invoke the command twice.
Example:
login as: root
root@osmc-pi's password:
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Thu Nov 5 00:13:43 2015 from 192.168.178.28
root@osmc:~# find / -name DialogSeekBar.xml 2>/dev/null
root@osmc:~# find / -name DialogSeekBar.xml 2>/dev/null
/usr/share/kodi/addons/skin.osmc/16x9/DialogSeekBar.xml
/usr/share/kodi/addons/skin.confluence/720p/DialogSeekBar.xml
root@osmc:~#