rogerr,
Please be very,very careful how you handle this, I was arrested years ago after money went missing from a flat I was working in, luckily one of the flatmates was caught the same day,but I will never forget that feeling,there could well be a very simple answer,he might have borrowed it to light a blow lamp or cigarette, I often find things in my tool box that aren't mine,say a screwdriver or tape,that I hadn't noticed when leaving a job, and my mate has put them in with my tools,we return them or I would be overrun with them, so please think carefully, Ray