So last move (2 years ago) my Kiddo(chronic mental and medical high time demand) dumped my cards and I am still trying to sort them back. ** As of now I am using hair ties to make sure they don't get "accidentally" dumped again. If they do it will have to be done with some fore thought.
Example of someone using hair ties and smaller internal boxes to prevent zettelkasten cards from being dumped out due to child mischief.
via: https://www.reddit.com/r/antinet/comments/1bv6sxy/moving_again_and_a_tip_on_transporting/