I would suggest removing the owners manual from that box, they tend to get some moisture in there and they can get ruined over time
tool? I like to keep mine in a water proof plastic container for same reason, coat with a little light oil first!
it keeps them from getting rusty over time, I also add some more useful tools too, like vice grips, zip ties, and a small LED flashlight! !
I also carry a good winch bag, with a snatch block,D shackle ,tree saver strap, ratchet straps and some other things that tend to come in real handy out in the field on an atv
also a good idea to keep a few bungee cords on racks too, they also come in handy and last a long time there?

over the yrs you tend to find things that help while out and about
a folding hand saw is nice at times too LOl
you can also get a decent sized army ammo can and just attach that to your rack to store things in too, very common ad on on atv racks