Investigators say the man walked into the employee lounge of the Office Depot store on Concord Pike in Wilmington Wednesday at 5:45 p.m.
The man took a female employee's wallet from the lounge and walked out of the store with it.
He then tried to use the woman's credit card to buy electronics items at the Target store on Brandywine Parkway. The card was declined and the suspect left.
Anyone who recognizes the suspect in the surveillance pictures released Friday by police is asked to call Delaware State Police Troop 1 at 302-761-6677 extension 309.
Tips can also be submitted by using the Delaware State Police Mobile Crime Tip Application available at www.delaware.gov/apps.
Information can also be provided to Delaware Crime Stoppers at 1-800-TIP-3333.