The incident happened shortly before 7 p.m. on Thursday, July 29, at the Walmart located at 1850 Veterans Memorial Highway in Islandia, according to the Suffolk County Police Department.
The suspect was described as being a white man with a medium build and brown hair, said police. He was reportedly wearing an Air Force Thunderbird Air Show t-shirt, dark shorts, and white socks.
Police said the man drove away in a dark-colored four-door pickup truck with an aftermarket toolbox affixed in the truck bed.
Authorities are offering a cash reward for information that leads to an arrest. Anyone with information can call Suffolk County Crime Stoppers at 1-800-220-TIPS.
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