A number of years ago I took a job as the lead mechanic in a marina, I trusted the guys I worked with and never locked my box, the shop was locked nights and weekends and only 2 or 3 people had a key. This was never a problem at places I'd worked at in the past because everyone I worked with had similar quality tools and respected each others stuff. Well after several weeks of coming back after the weekend and finding my tools on my bench that was allways left clean I started to believe the stories about the owner "borrowing" tools.
I went over to his box and saw several of my tools in there and asked him how they got there. His excuse was that he was the only one around with orange handled Snap On tools, When I asked about the three marks ground into them (all mine do), He replied that all his tools had three marks in them. The only tools with marks in his box were mine.
That was the last time I believed anything he said.