A method for detecting double-fed mail pieces. The method includes receiving a first mail piece and a second mail piece together as a combined mail piece and scanning both sides of the combined mail piece to determine and store a first side identifier and a second side identifier. The method includes separately scanning the first mail piece to determine the first side identifier and a different second side identifier and separately scanning the second mail piece to determine the second side identifier and a different first side identifier. The method includes querying the identifier database using the first side identifier to retrieve the second side identifier associated with the combined mail piece and determining that the different second side identifier is now associated with the separate second mail piece. The method includes identifying the first mail piece or the second mail piece as a double feed mail piece.
