1. A data processing system for identifying documents, from one or more business entities in a mixed document environment, comprising: means for entering a plurality of information parameters from a plurality of known documents of different sizes from the one or more business entities, the known documents comprising multiple coupons, multiple checks, multiple cash-in tickets, and multiple batch tickets; means for storing in memory the plurality of information parameters from the plurality of known documents to create a first data list containing a discrete entry for each information parameter of each known document; means for reading a plurality of information parameters from a plurality of unknown documents of different sizes from the one or more business entities, the unknown documents comprising multiple coupons, multiple checks, multiple cash-in tickets, and multiple batch tickets; means for storing in volatile memory the plurality of information parameters from the plurality of unknown documents to create a second data list containing a discrete entry for each information parameter of each unknown document; means for sequentially comparing each discrete entry of the second data list with each discrete entry of the first data list; means responsive to the sequential comparing means for determining if a match exists between a discrete entry of the second data list and a discrete entry of the first data list, whereby each unknown document is identified.