A thief pretends to be a customer, steals a phone from the shopkeeper and gets caught on CCTV footage.

Hello everyone here.Hope you all are doing well.
In this video here is about a camera we had installed at a shop of a friend who sells electrical fittings. The thief came in accompanying other customers and this made the shop keeper relax and feel the thief was interested in shopping. But the shop keeper made one mistake. She left her phone on a position where the thief would see it.So the thief asked for something that would take time to deliver. He asked for a certain size of an electric wire. The wire had to be cut from the main roll of the size he wanted. He asked for one meter of the wire costing an equivalent of $1 here.In the event of delivering the serving the thief stretched his hand and took away that expensive phone costing an equivalent of $500.What a trade!

We sometimes write on items like the way you can see on the photo below to prevent theft;

It is relatively cheap but lose is too expensive.Instal a CCTV camera. What is your take?