The Great Neck incident occurred on Friday, May 10, Nassau County Police announced.
Just after 4 p.m. that day, a FedEx truck made a stop on Great Neck Road.
When the driver got out to deliver a package, the suspect opened the passenger side door and climbed aboard.
A video shows the man removing a bin full of 14 packages.
According to police, the boxes contained assorted jewelry worth a total of $5,000.
The suspect is described as a 55 to 60-year-old man who is 5-foot-11 and weighs approximately 265 pounds. He was wearing a baseball cap with “2024” written on it.
Anyone with information regarding the theft is encouraged to contact the Nassau County Police Department Sixth Squad at 516-573-6600, the NCPD Crime Stoppers at 1-800-244-TIPS, or by submitting a tip online here.
Detectives will give an award to anyone with information that leads to an arrest.
All tips will remain anonymous.
Click here to follow Daily Voice Southampton and receive free news updates.