A method for uniquely identifying mailpieces having non-personalized enclosures during an inserting and printing process in a mailpieces production system, the method including: creating a Job file containing at least a mailing list of addresses to be printed on mailpieces, allocating a distinct mailpiece identifier for a mailpiece, allocating a temporary machine identifier to a non-personalized enclosure extracted from an insert feeder of the mailpiece production system, associating said temporary machine identifier with said distinct mailpiece identifier and recording the mailpiece identifier as being in process, creating the mailpiece by inserting at least the non-personalized enclosure into an envelope, printing on the envelope an address associated with the mailpiece identifier, and recording the mailpiece identifier as being inserted.