A set of ``core'' data items (CDIs) has been identified, which were verified from observatory records available at each station. These core items are generally the information necessary to process correctly the image and/or are crucial for scientific analysis. While many of the verification procedures are automated, it is necessary in some cases to consult the hand-written scripts or logs to obtain the correct information. The verification of the CDIs is performed before each image is reprocessed for the Final Archive.