In a large store like the one i am in, we get lots of petty and not so petty theft, usually by known faces who of course pick the quiet times, as professionals tend to do, not busy times when there are loads of people about. the most theft takes place between 9 and 10am and 4.30 and 5.30 pm, when they know there are less staff on duty, less witnesses and staff are busy with paperwork or recovery.
most of the thefts are done by smack heads after expensive brands to sell on within minutes to fund their habit.
i have spotted loads over the years, the last one was on christmas eve, apparently the woman had a 6 week old baby and needed the cash for her habit but she sent xmas eve in the cells.