Between 1977 and 1980 I was making a living doing marine electronics repair. No kids at the time. By 1983, I had purchased a new house and had two kids. My tools were on my bench in the garage and only used as necessary for occasional tasks. Over time, I discovered some of the contents were missing. My kids were taking tools out to neighbors houses to "fix" problems and just leaving them. I put locks on all my toolboxes to stop the loss.
I’ve painted all my tools (and clamps) Robin egg blue. It’s a reminder to a neighbor to return them. So far, I’ve only lost one tool, but it was a giant off-brand Channellock that I miss very much.