How long though will it take to pack boxes? If you can plan ahead a little now you can save time packing.
Important documents/papers for example, rather than pulling them out of a file cabinet or such I put them all in a zippered binder so its quick and easy to grab. It even has a pocket that my backup drives fit in so I don't have to pack and carry those separately, I just made it my normal procedure to store there when not running a backup.