hmmm I like the idea of a lockable toolbox but it may look odd in the cupboard. Our kids are too young to go rummaging in the cupboards just yet, but they are getting bigger. Plus my sister-in-law sometimes goes into the cupboards looking for clothes (as she shares with my wife). Hmmm, might need to do more googling.
Thanks for the suggestions.
Someone else suggested a lockable file box on another thread. That might make more sense in a bedroom cupboard than a toolbox. And important papers aren't the kind of thing that someone might want to borrow. :-)
I use a leftover gift box from a wine sampler/gift set (small bottles). The bottom part has sturdy dividers, so it's good for longer toys. I made some dividers to go in the smaller top part, just to keep things organized. Everything that might possibly melt or otherwise degrade goes in cotton bags first. Privacy isn't an issue for me, this is just an example of adapting/re-using something else.