I've actually did this to someone at my college. It's incredibly easy. I'll wager a hefty sum that your printer is shared on the network, and someone simply printed those documents on your printer over the network.
I made a page that said "bring this to blah blah dorm room blah if you get it" and about 3 hours later this guy comes in saying his printer turned on by itself. It's simple; just create a text document and choose a printer off of the network to print it.
If your printer isn't shared, then it does sound like a hacker.
-Lasereth
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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