Also, any valuables you have under a table or counter should be protected with a sturdy material, like masonite or plywood, that is not easy to cut through. Valuables or cash behind a single sheet of fabric are not secure. Frequently theft occurs when a criminal identifies where you keep your valuables, perhaps even by purchasing something. When they know where it is, it is easier to take. Whenever anyone is taking too much of your attention or the situation just seems unusual, take a step back and evaluate what is happening.
Criminals usually work in pairs.
Often they will buy from you while they are stealing from you. A customer who is purchasing something should not be overlooked as a potential criminal. Also, a customer who is looking at only your most expensive pieces may mean that something else is going on. While you are distracted and excited by the potential sale, an accomplice may be ripping you off. Step back and evaluate.