When Abby is telling the team about the $200 found in the dead woman's possession, she states they were new bills minted in Philadelphia. The US Mint creates only coinage. Paper currency only comes from the Bureau of Printing and Engraving in DC. No paper currency comes from Philadelphia. Paper currency is not be "minted."
Philadelphia is a Federal Reserve District and therefore the number C3 (3 only on $1 notes) would be on the face of each note.