I found this to be interesting too.
I zoomed in on the Bomford BC and noticed the lettering of the document seems to have no distortion where the folds are.
If you look at the word 'Page', it seems to have been typed or printed right over the very faded fold.
Also the word "South" in 'State of South Australia' seems strangely 'crisp' in light of the background.
![](http://i42.photobucket.com/albums/e306/kb2zlz/miscellaneous/bomfordfold-1.jpg?t=1249356637)