I wouldn't be surprised if someone out there makes a cheap consumer grade shredder with some shape more obnoxious than diamonds too...
Staples.com doesn't actually carry diamond-cut shredders. At least, none that I can find.
The smallest shred size I can find there is 3.175mm x 9.525 mm. By comparison, the document in the fifth puzzle is taken from a legal pad (8.7 mm line spacing), and the shreds are only a little bit longer. Would the shape really make that much of a difference at this scale?
Amazon sells relatively cheap security level 4, and rather expensive security level 6 shredders.
Imagining a real-life scenario of dozens or hundreds of documents mixed together in a shredder bin makes my head hurt.
So, I wouldn't worry too much about your shredded docs just yet.
I was surprised to find that this method doesn't scale well when the puzzle reaches a certain size.
;-)
