Tracking Customer Master Changes

Good morning group.

Our auditors have asked us to generate a report documenting changes to the customer master file.  I seem to recall seeing a white paper or conversation on this in the past where a custom table is created and the address book file is copied to this table each day and then a comparison is made between the custom table and the address book each day before the copy is done again.  We have created this, but they are looking to see a list of all changes over say a three month period.  They want to be able to come into