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Okay, here is the problem: Have you tried asking the state for the said information?
While Obama might not have kept copies of his years in the Illinois Senate, the state probably did.
If the records don't exist, well that kind of means that the New York Times, which claimed to examine his Illinois Senate records, lied.
After all, you can't examine what doesn't exist. And note, this is not a link to a pro-Obama article.
http://www.nytimes.com/2007/12/20/us/politics/20obama.html?_r=1&adxnnl=1&oref=slogin&adxnnlx=1203498108-/oeebo6ACD2uvgpCSX8S6g