Apparently he found them at a demolished building site, nice find.
Its often hard to get the texture of paper on to appear from a scan so its best to photograph it.
But if you are stuck for time try these seriously distressed images for size.
There are a heap of other links to textures (other than paper) available at sharebrain, much of the content on this site is aimed at web designers but often the images are available in high resolution and good enough to print.
Yeah g'day! Here's a few links to a couple of different stock image libraries which you might want to use in the future, or you might just want to use them now as inspiration:
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