The incident happened in Poundland on Sauchiehall Street, Glasgow, at about 5.15pm on Friday, May 30.
Police have appealed for the man in the image to contact them as they believe he may be able to help them with their inquiries.
He is described as of Asian appearance, aged 40-49, about 6ft and of medium build.
He was wearing a white baseball cap, glasses, a navy blue jacket and light-coloured body warmer, blue t-shirt, dark denim jeans with the bottom turned up and was carrying a khaki-coloured backpack.
Inspector Kenny Darroch said: "I would appeal to anyone who was in Poundland on Sauchiehall Street around the time of the incident to contact officers.
"I would also ask anyone who can help identify the man in the image to contact Baird Street police office on 101."