1)
echo "19 8" >/proc/eink_fb/update_display (inverted display)
2) [root@kindle root]#
ls /usr/java/lib/fonts
(There are other folders pertaining to fonts but I think you mean that one)
3)
ls /opt/amazon/screen_saver/600x800
(There are other pngs kicking about but I think those are the ones you mean)
Here's some more...
4) [root@kindle root]# cat /etc/TZ
Also
THIS POST may help you
(as an aside.. from a backup of a 3 I noted the following)
cat /home/me/Desktop/K3FATBACKUP/etc/TZ
Hope that is everything.