I lock the box whenever i'm not around it, in a shop environment.
When i was going to lunch or whatever, i'd lock my box and leave my friend the keys, so if he needed anything he could go ahead and take it. I never once worried about him doing anything he shouldnt, it was the other people in the place that i didn't want going near it. More than once i found the boss trying to open it (couldn't figure out Lock 'n' Roll..) to get things.
In another place i worked, if i wasn't using my tools and was next to the box (It was alongside my bay.) then it was locked. When i went to lunch, it was locked. There was a guy there who i didn't trust in the slightest. He was ultimately sacked for stealing ~£4-worth of parking vouchers from a customer's car.
At home, when not in use, i keep the box locked and everything tidied away. If i'm not working on something it's locked. We live in a gated "community" of only a few houses, everyone knows each other and get along. No one here would touch anyone else's stuff. I often run into the house to grab something and leave the box open and the garage door up, when i stop for lunch i leave everything as it is and close the garage door.
Only one time, i had a car in the garage with the ***-end sticking out so i couldn't put the door down. Had tools everywhere, but left everything as it was. Came back and my friend had put a sticker on my toolbox, nothing else was touched!
i don't work in a shop but i still lock up my boxes after i'm done. the way i see it, you can never can be too careful. i'm half tempted lately to put some d-rings or something on the poles in the barn to chain the boxes to
I plan to set a ground anchor into the garage floor and have a steel plate and eyebolt attached to the box. Then i'll secure it with a short chain. Hopefully the steel plate and eyebolt will be welded to the bottom of the box. Having a short chain will mean that the box won't even be able to move, so no chance of getting an angle grinder in there, and chain tough enough that bolt cutters won't cut it.
