Abstract: For use with a mailing packet assembling apparatus that creates a mailing packet from items comprised of machine readable indicia encoded forms and machine readable indicia encoded envelopes that are transferred into the assembling apparatus, a verification system for determining that the correct items are transferred for assembly into the mailing packet. The system has a data base with information on the items within the mailing packet, thereby establishing which forms and envelopes are required in the assembled mailing packet, a plurality of dynamically controlled detectors for identifying the indicia on each form and on each envelope, and a computer for verifying that the data base information and the dynamically detected form and envelope indicia correctly correspond or do not correctly correspond to the desired mailing packet and, if correct, direct the mailing packet to be assembled.