My belief is that Hawaii may have destroyed the birth certificates when they went over to their computer system.
Abercrombie probably found this out when he went to get an original and had to back off his statement that he would prove it for Obama.
Here’s the deal. If you open the pdf in Illustrator and press apple-Y to see outlines, you can clearly see boxes that have been placed on top of areas (including the birthdate). If this were a scan of a document, it would be flattened (one layer). There should be absolutely no boxes on a scan unless something has been added on top. See below:
http://i56.tinypic.com/2pt30jq.png