The theft happened on May 6 at the courthouse at 1301 Filbert Street in Center City.
Investigators say the woman seen in surveillance video used credit cards that were inside the stolen purse.
The credit cards were used at several stores along Aramingo Avenue.
Call police at 215-686-TIPS (8477) if you can identify the suspect.
You can also text a tip to PPD TIP or 773847.